Buy Viagra with Dapoxetine online at our pharmacy. No prescription required. Lowest price guaranteed. Free Worldwide Shipping. Reorders huge Discount.
buy antibiotics online


THIS AD DOES NOT APPEAR TO REGISTERED USERS!
Page 1 of 2 12 LastLast
Results 1 to 15 of 22

Thread: Symptoms of bad or Gelled fuel

  1. #1

    Default Symptoms of bad or Gelled fuel

    Hey guys.

    My father borrowed my truck one day to haul a load of firewood. He put fuel in it beforehand.

    What are the symptoms of bad fuel or gelled fuel?

    Right now i've got a P0251 and P0370, which Bill Heath says when those together pop up it indicates a bad LP. The LP was warrantied out not 2-3 weeks before all this started and it has great flow and pressure. The warrantied one had great fuel flow and pressure afterwards i found out, and my fuel psi gauge was bad and maxing out at only 4 psi. I thought it was bad because i had gotten a P0251 and P0370 on the ride back from a large parts run two states over to Massachusetts a few months ago. Swapping the LP made the codes go away and stay away.

    along with the two above codes i get extended cranking to start the truck, outside and engine temperature doesn't matter. Once the engine is running the idle will lope from 900 to 400 all on it's own, all the while puking black smoke from the exhaust. Sometimes it'll lope once or twice and clear up and run fine, other times it'll lope for what seems like eternity, but it'll always clear up and run fine afterwards. Other symptoms include Coughing, sputtering, misfiring all during the time the engine is loping, and it's even died altogether a few times on me.

    Strange thing is this comes and goes. When it runs fine it runs perfect. I tested to see if it was a fuel supply issue by heading to the mile and 1/2 long 6% or so grade by my place. I started at the bottom of the hill and kept the go pedal pinned the entire time. Pushing 15 psi boost and running with full power up the hill. It ran perfect, no coughing, nothing. Then about a mile later, the symptoms showed back up again, along with the check engine light and a change in the diesel rattle. I promptly shut the engine off and restarted it, and the extended cranking and loping idle were back as well. The loping idle and coughing/etc is only when starting the truck. Once running it's fine. It passed the hold at 2K RPM test as well. All the symptoms come and go at the same time.

    Could this be bad fuel? New fuel filter was installed the first day this started. No change. No WIF light. Added 1/2 a bottle of Power Service white bottle and 2-stroke oil, cleaned up battery connections and grounds and nothing seems to have helped.

    Could my IP be dying? The truck has 188K on it with evidence that the IP was changed before by a dealer but i've no idea what mileage it was changed at.

    I'll get a video once the freezing cold winds and snow dies down a tad.

    Thanks guys,

    - Dave

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

    Stomp On The Right Pedal Club Member #28


    DTR Brotherhood of Handshakers Member #37



  2. #2
    Registered User Dave01's Avatar
    Join Date
    Aug 2008
    Location
    NH
    Posts
    249
    Member #
    879


    Default

    I doubt its bad fuel, you'd have the trouble all the time, not some of the time and other times perfect. Just for a check, run a cup of fuel out of the t-valve just to see what it looks like. Also doubt its gelled fuel, once running you've got a heated filter manager plus heated fuel return-to-tank. Have you added any bio-diesel recently? If so, then I might suspect junk or gelled fuel.

    If your IP passed the hold 2,000 test (I assume it also passed the ramp it down slow from 2,000 test) it hopefully rules out the IP as well.

    If fuel delivery seems OK, an intermittant problem like that is probably electrical. You've checked grounds and battery connections, but how about the batteries themselves? Are they OK, each putting out the proper 12 plus volts? Are you seeing 14 plus volts when running?

    My quick guess is PMD. Do you have a known one you can try to prove this out?
    '98 GMC K2500 Extended Cab Long Bed w/Fisher Minute Mount 1
    '98 GMC K3500 Crew Cab Long Bed Dually
    Sold
    '97 GMC Suburban 2500 4WD 6.5 L65 "F" remote PMD
    Heath Max-E-Tork GLE PCM, Heath Turbo-Master, Raptor fuel pump, vac pump delete
    4L80/85E transmission 4.10 gears 265/75-16 Firestone Transforce A/T tires, 4" exhaust with Kennedy quiet muffler
    2-tank wvo conversion - Boost, wvo Fuel, and fuel pressure gauges on A-pillar, EGT and fuel temp below dash

  3. #3

    Default

    Haven't tried the down from 2,000 RPM test yet. Will try that now. I have a Midtronics carbon pile load tester here as well as a Midtronics Handheld battery/starter/alternator tester. Both testers confirmed that the batteries were both good and had over 900CCA's each. They are rated for either 800 or 880 CCA. Can't remember now.

    Don't think i've run any Bio-D lately, unless it was blended in with the regular pump diesel. There's no stations that i'm aware of, or at least that i go to, that carry Bio-D.

    I hope it's not a PMD. It's the Heath Isolator kit. Could be...

    Strange that once it's running it's fine save for the SES. Shut it down and bang it's back to it's crap.

    This is so frustrating.....

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

    Stomp On The Right Pedal Club Member #28


    DTR Brotherhood of Handshakers Member #37



  4. #4

    Default

    Just did the down from 2,000 RPM test. That's fine too.

    No SES light when i went out now. I've got the block heater plugged in to see if engine warm or cold matters.

    Not sure what else i can test.....

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

    Stomp On The Right Pedal Club Member #28


    DTR Brotherhood of Handshakers Member #37



  5. #5
    Registered User 97duallydiesel's Avatar
    Join Date
    Nov 2009
    Location
    Cape Cod
    Posts
    108
    Member #
    4989


    Default

    Dave , i feel your pain man.. I'm having similiar problems Steve
    DTR.com Dually Club Member #70
    Steve



    97 GMC Dually Diesel "F" 250K miles . SSDiesel 4" exhaust . Autometer gauges in overhead console.PMD relocator. homemade TM. Hybrid SSDiesel/oem w/ amsoil intake.

  6. #6
    Registered User SmithvilleD's Avatar
    Join Date
    Mar 2009
    Posts
    729
    Member #
    2434


    Default

    I'm guessing you don't have a fuel pressure gauge?

    Reason I asked is last night I drove my truck 250 miles in the coldest temps so far on the new engine/setup. -10 F at startup. Fuel got a shot of the white/winter bottle Power Service additive at the pre-trip fillup. I'd expected the cold temps before leaving my somewhat warmer MO home temps before heading up to IA. So I'd swapped my Racor pre-lift pump 10 micron filter back to the 30 micron. Glad I did.

    My mechanical fuel pressure gauge shows each pulse from the Walbro pretty crisply. & that lessens when you're on it hard enough fuel demand goes up.

    Last night at -10 F startup, watching the fuel pressure gauge made it easy to envision the pump was pushing syrup instead of low viscosity fuel. Much slower pulsing & the pressure at normal hwy cruise load was a couple psi lower.

    On the 250 mile drive back to MO, I felt fishbites numerous times. Seemed to typically be at mid-load but not necessarily getting worse as load went up/fuel pressure went down. Don't know if it might be sucking air in somewhere pre-lift pump when cold causes fuel viscosity to go up?

    Don't know if your situation could possibly be related as you mention it happening at different outdoor & engine temps? Just thought I'd share as I'd guess you're getting colder temps now as well.
    1995 K2500, 8600 GVWR, 6.5TD, NV4500, 3.73:1, ~19:1, balanced, Fluidampr, DSG timing gears, '97 cooling upgrades, DMax fan - SD fan clutch, Kennedy TD-Max chip, 2350 psi/pop marine injectors, 4" exhaust, ceramic coated exh manifolds/turbine housing/crossover pipe, Autometer: pyrometer, boost, oil temp, oil press, fuel press, & water temp gauges, remote oil filter, B&M plate-style oil cooler w/ braided SS oil lines, 10 micron Racor pre-lift pump, Walbro FRB-5, GMTDScan Tech, Dipaco PMD -lrg heatsink frnt licence bracket in bumper

  7. #7
    Diesel nut 94K30's Avatar
    Join Date
    May 2008
    Location
    manchester CT
    Posts
    234
    Member #
    293


    Default

    might sound too simple, Dave, but how is the fuel filter?
    1994 Silverado K3500, "F" code 6.5 TD,American Racing Diamondbacks,265/75/16E General Grabber AT2's, 8'minute mount,Modified SSD Intake with S&B filter, Turbomaster,160 Amp alternator,Bosch injectors, 60G Glow Plugs,Manual Glow Plug Override,Lift pump Relay mod, Delphi '93 lift pump, D-tech FSD mounted in bumper, Stanadyne fuel additive with 2 cycle oil, 174,500 miles so far

  8. #8

    Default

    Quote Originally Posted by 94K30 View Post
    might sound too simple, Dave, but how is the fuel filter?
    The filter in there is a week old if that. The old one was dirty, but it wasn't the worst fuel filter i've pulled from that truck.

    I've no idea what's going on. Went outside again to disconnect the block heater in both trucks as i've got no where to go tomorrow morning and tried the pickup again. Fired right up and ran perfect. I don't get it what am i missing?

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

    Stomp On The Right Pedal Club Member #28


    DTR Brotherhood of Handshakers Member #37



  9. #9
    Registered User Dave01's Avatar
    Join Date
    Aug 2008
    Location
    NH
    Posts
    249
    Member #
    879


    Default

    One more thought - air leak somewhere. That would let fuel bleed down causing the long cranking, would also cause hiccups and uneven idle. Not sure why it would go away at times though ......
    '98 GMC K2500 Extended Cab Long Bed w/Fisher Minute Mount 1
    '98 GMC K3500 Crew Cab Long Bed Dually
    Sold
    '97 GMC Suburban 2500 4WD 6.5 L65 "F" remote PMD
    Heath Max-E-Tork GLE PCM, Heath Turbo-Master, Raptor fuel pump, vac pump delete
    4L80/85E transmission 4.10 gears 265/75-16 Firestone Transforce A/T tires, 4" exhaust with Kennedy quiet muffler
    2-tank wvo conversion - Boost, wvo Fuel, and fuel pressure gauges on A-pillar, EGT and fuel temp below dash

  10. #10
    Registered User ak diesel driver's Avatar
    Join Date
    Feb 2009
    Location
    alaska
    Posts
    9,414
    Member #
    2334


    Default

    Put a fuel pressure guage on it so we can tell if it's a fuel issue or electrical
    96 gmc k2500 4" exhaust, marine inj, #9 resistor, GL4, turbomaster, duraterms,-1.94 TDCO,FTB, remote pmd, isspro pillar gauges, lift pump relay added ,141 block, 2 1000 w block heaters, 2 150w glue on oilpan heaters, 2 150w glue on transpan heaters, 97 K47 air filter , IP replaced at 229k ,gear drive set awaiting install, Parts for intercooler waiting to be installed

    94 k1500 excab sb 6.5 plow truck. Fisher plow w/engine driven pump, F intake, h/m turbomaster, plowing chip by Buddy, remote PMD w#9 resistor, Duraterms

    96 k3500 CC 6.5 dually
    94 k2500 excab lb 6.5 parts truck
    00 burb 5.3 wifes
    70 Ford reg cab lb 428 cj richmond 5spd lockers 35s
    75 Vette built 383 needs work
    62 Tempest convertible way on the back burner project
    85 Honda VF1000R
    90 P30 Cummins BT4 work van
    90 Int SA dump w/trailer
    416c backhoe

  11. #11
    Registered User buddy's Avatar
    Join Date
    Nov 2008
    Location
    California, central coast
    Posts
    6,093
    Member #
    2043


    Default

    Sounds like contaminated fuel, or lack of fuel pressure. Do you know how to do the LP diagnostics for you truck to check that its all functioning? Does it work with just Ignintion On during WTS?

    Have you looked at the IP lately? Are the 3 nuts still on there? Its probably your timing, or related to the Coolant temp sensor. Starts fine with block heater, how long is your preglow?

    Do you know how to check and change the timing? Id check what the TDCO value is, then run the KOKO procedure and see what it is afterwards.
    94 6.5TD C1500 ECLB w/ 50 gallon aux tank/box; 235/75R17 tires on Alloy wheels; 3.42 gears; A-Team Turbo; 4" Aero Turbine 4040 muffler to 5" Aero Turbine 5050XL muffler to 6" tip before rear axle; FSD heatsink, marine injectors; "F" intake; SynBlend 10W-30 oil; Walbro FRB-5 w/ 12 micron prefilter; Feed The Beast; WMI and Propane fumigation; OPS extension & relay; 110K original miles; Engh GMTDScanTech
    Near Future: Battery relocation, Amsoil Nanofilter behind headlight, and stereo upgrades
    Veterans of America Club, member #18

  12. #12

    Default

    Quote Originally Posted by buddy View Post
    Sounds like contaminated fuel, or lack of fuel pressure. Do you know how to do the LP diagnostics for you truck to check that its all functioning? Does it work with just Ignintion On during WTS?

    Have you looked at the IP lately? Are the 3 nuts still on there? Its probably your timing, or related to the Coolant temp sensor. Starts fine with block heater, how long is your preglow?

    Do you know how to check and change the timing? Id check what the TDCO value is, then run the KOKO procedure and see what it is afterwards.
    Glowtime is quite long due to the GL4. Last time i counted the GP light was on for 7-8 seconds.

    Timing should be good. TD set it but his scanner didn't like my truck so i had to check it w/ a tech II at my college. Came up as -0.90 then.

    The LP runs on WTS, and with the engine running. I get plenty of fuel from the water drain with the engine running and it doesn't stall. I do know how to do the LP diagnostics, just have to borrow my friends pressure gauge, mine's busted.

    Could the optic sensor be going? i did remove the OS filter harness a while back(maybe a year ago or close to it) as it was going bad, and causing issues.

    The more i sit here and think about it the more i think it's contaminated fuel. The OS has to see through the fuel, and if it's cloudy it can't. My blazer has fuel from the same station in it but the DB2 doesn't have any sensors in it that have to see through the fuel so it just burns it.

    Hmmmm....time to take a fuel sample i think.

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

    Stomp On The Right Pedal Club Member #28


    DTR Brotherhood of Handshakers Member #37



  13. #13
    Registered User SmithvilleD's Avatar
    Join Date
    Mar 2009
    Posts
    729
    Member #
    2434


    Default

    Were the issues happening before the recent fuel filter change?

    Also might try cracking the water in fuel/filter mgr drain valve (while the lift pump is running) & see what comes out?
    1995 K2500, 8600 GVWR, 6.5TD, NV4500, 3.73:1, ~19:1, balanced, Fluidampr, DSG timing gears, '97 cooling upgrades, DMax fan - SD fan clutch, Kennedy TD-Max chip, 2350 psi/pop marine injectors, 4" exhaust, ceramic coated exh manifolds/turbine housing/crossover pipe, Autometer: pyrometer, boost, oil temp, oil press, fuel press, & water temp gauges, remote oil filter, B&M plate-style oil cooler w/ braided SS oil lines, 10 micron Racor pre-lift pump, Walbro FRB-5, GMTDScan Tech, Dipaco PMD -lrg heatsink frnt licence bracket in bumper

  14. #14
    Registered User
    Join Date
    May 2008
    Location
    Tewksbury Mass.
    Posts
    691
    Member #
    674


    Default

    Dave, I went through EXACTLY what you are experiencing now and it was bad fuel. It took a couple of tanks and fuel conditioner to clear it out. I just came home from seeing your thread on the other site a couple of hours ago and the more clues you give, the more it is identical to my problem a year ago. The only caveat is that on my last tank (that cleared the problem) I also changed both batteries that were getting a tad weak, so I'm giving you ALL the facts.
    96 1500 4x4 suburban F-series engine
    3 to 4 inch exhaust-stainless crossover
    Oilguard bypass oil filter with additional permacool dual remote oil filters adapted to take two 1 1/2 quart Mobil 1 m1-403 filters---10.5 quart capacity now
    B&M Deep Tranny Pan
    Remote fuel filter with 1R-0749 CAT 2 micron filter or Donaldson 551000 and 200 watt electric pad heater
    Walbro FRB-5 Lift Pump
    Dipaco Remote FSD #9 resistor behind bumper
    1999 High capacity (opt K47) Air box
    3.42 gearing with 235/85-16 michelins
    A-Team Turbo, Vacuum Pump Deleted 99.5" belt
    -1.83 TDCO set by Matt Bachand

  15. #15

    Default

    Quote Originally Posted by SmithvilleD View Post
    Were the issues happening before the recent fuel filter change?

    Also might try cracking the water in fuel/filter mgr drain valve (while the lift pump is running) & see what comes out?
    This all started after my father put fuel in. He said it ran fine when he went to haul a load of wood that day. I changed the fuel filter the next when it first started acting up on me. The old filter didn't look terrible. I've pulled worse looking filters from the FFM. New filter didn't change anything.

    I've got a bottle of Diesel 911 that i'm going to dump in now. Going to see if that helps.

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

    Stomp On The Right Pedal Club Member #28


    DTR Brotherhood of Handshakers Member #37



Page 1 of 2 12 LastLast

Similar Threads

  1. Symptoms of a weak IP?
    By 6.5TD Burb in forum GM 6.5 Diesel Engines
    Replies: 13
    Last Post: 08-04-2009, 11:16 PM
  2. finally gelled up
    By Farmdog in forum Maintenance & Fuels
    Replies: 4
    Last Post: 12-24-2008, 04:06 PM
  3. Symptoms for bad ignition switch?
    By Pillow in forum GM 6.5 Diesel Engines
    Replies: 13
    Last Post: 08-29-2008, 12:22 AM
  4. Who Gelled This Winter
    By durallymax in forum Maintenance & Fuels
    Replies: 12
    Last Post: 05-11-2008, 12:59 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •