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I have a 3271 pencil injector pump I plan to put a EID inside along with a new spaco seal kit.Theres no “E” tag on the governor cover screw so it most likely still has the flex ring inside.The umbrella seals are leaking also on the driveshaft.I’ve used this pump I’m going to say at least 15yrs...

I had a few of my nos gm pencil injectors tested a couple weeks ago at a local stanadyne shop that I bought from eBay and the shop called to tell me they are junk.The pintle is seized with no way to fix them.Thats the thing with buying new old stock pencil injectors for this type of engine...

No problem.Glad I was able to help👍

Yes that is true.I believe I’ve seen this sort of thing with the 6.2/6.5 as well.

Here are a couple pictures I found online showing a hole in a 5.7 diesel piston because of a bad pencil injector.I’ve never seen this happen on the olds diesel.Very interesting to see that’s for sure.Supposedly the owner was saying the engine ran pretty good all along until this happened. It...

I’m heading back to work in a couple days so I’ll get back at the truck when I return home.I’ll put a clear hose on the pump return fitting and see if any air is upsetting delivery.I have a fuel pressure gauge here with a barb fitting on each side so I can easily make it a permanent thing under...

Yesterday I noticed a small amount of coolant under the radiator on one side.Has all new hoses and clamps on it.New petcock with sealer on the threads as well.It must have a small pinhole in it someplace.This morning I ordered a new all aluminum radiator on Amazon with good reviews so I went...

Here’s an updated video of how it runs now as of today.Much,much better at the moment.It runs smooth and then after awhile after reving it a few times and when it returns to idle it becomes rough again and not steady.Maybe an injection pump problem causing something to hang up or stick inside?I...

I have a new pop tester here I can try them on when the injectors arrive.I read the opening pressure on those pencil injectors is 1700psi and the later model poppet nozzle injectors is 1000-1225psi depending on the year. I have heard they are a throw away type of injector.Once the needle and...

Last night I decided to purchase a set of used pencil injectors from a guy I chat with overseas.They look to be in pretty good shape.I’ll clean them up when they arrive.Total was around $250 delivered.

Today the new fuel hoses and water in fuel wiring was installed along the chassis.The 3/8 Barb-1/8 npt fittings were installed into the electric lift pump under the truck so all went okay with that.Just a matter now of getting the wiring in place inside the truck in regard to the water in fuel...

I think this will be a great feature when I finally have the water in fuel harness all in place.The new fuel lines are installed along the chassis up to the sending unit.The wiring connector is in position at the sending unit.I just need to run the harness along the chassis now and into the...

Today I made a stab at replacing the old fuel tank sending unit in favor of a updated version with the water in fuel sensor.The old fuel line hoses are gone now.I got rid of all that along the chassis.Tomorrow I hope to install the new hoses and get the water in fuel wiring started.The old...

Thanks jay.I’ll definitely look into that and give it a go.Yesterday on eBay I came across a new elastomer insert drive governor cage which does away with the flex ring along with a o-ring/seal kit.I have a new old stock 3271 pencil injector pump that doesn’t have much use on it.It has no E tag...

On Monday I’ll try to get the new fuel tank sending unit and new fuel line hoses installed on the chassis going from the sending unit to the fuel filter housing.The hoses are probably 15yrs old and are hard and probably cracked in places.This could also be part of my rough idle problem.More...

This morning I put another belt tensioner on this engine from Napa as the previous new tensioner under the ultra power brand I installed was making a clacking noise not to mention fluttering back and forth.As of now there is no belt flop or any noise.The tensioner now is definitely much...

I just arrived home from work last night so hoping to get back at the 5.7 diesel tomorrow and do more work on the truck.I bought a nos gm water in fuel option for the 78,79 trucks that didn’t have the water in fuel light.The kit I bought has the light,wiring harness and new fuel tank sending unit.

I purchased a new gm crank sensor for the 6.5 diesel this morning.I have the 6.2 with the DS4 but these sensors are going at a good price and seller has quite a few left. https://ebay.us/m/70ynAJ

I checked that measurement out before I installed the hydroboost.Both of those steel pins are the same length when I did the comparison so I should be okay.The 1979 hydroboost pin was the same length.It was just the long rod that attaches to the brake pedal lever was too short on this newer...

I had to make a bracket so the hydro boost pushrod could be attached to the brake pedal lever.Seems this newer hydro boost fits the 90s gm trucks instead but I was able to make it work out okay.I reused the original hydroboost firewall mounting bracket from 1979 which worked out good also.I did...