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Water in fuel sensor & fuel heater in the fuel filter housing ?

Discussion in 'GM 6.5 Diesel Engines' started by Crankme69, Aug 23, 2010.

  1. Questions about the filter manager on my 95...?

    Is the fuel heater in the filter manager the same element as the water in fuel sensor…are they one in the same?

    I so far have unplugged the 2 wire connector directly located behind the fuel manager that appears to have 2 wires running to the bottom section of the filter housing, best I can see anyways without removing the filter housing.

    Is there another plug for the fuel heater or does this 2 wire plug supply power to both the water in fuel sensor & the fuel heater in the fuel manager or like I asked above does the one element do both?

    TIA :thumbsup:
  2. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    no, they are 2 different elements, & 2 different connectors
  3. vail426

    vail426 Member

    May 17, 2008
    On the side of the housing near the bottom is the water in fuel sensor. It is held there by 2 screws and has 3 wires to it. The heater as you know is at the bottom with 2 wires.
  4. Excellent thanks so right now I have the 2 wire connector unplugged, that must be for the heater, correct?

    Looked online at rockauto, no replacement heater element to be found...maybe I am not looking in the correct section?
  5. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    Probably have to go to stanadyne dealer to get one as that is who makes the filter mgr, or possibly a dealer for the p/n
  6. I found the part # in the sticky section THX!
  7. The GM part number listed here does not come up with anything?

    The GM part number the dealer supplied me with for the fuel heater is 12511964, GM dealer part retail $199.44.

    Stanadyn has no cross reference for the part number, the gent I talked with at the local dealer is sending stanadyn an email & will call me back.

    This may very well end up coming from the junkyard if i can not find one used from a member...?
  8. great white

    great white Well-Known Member

    ssdieselsupply (TD Edit, direct hotlink to non site vendor edited out we don't provide free adverts to non site sponsors that compete with existing sponsors with hot links to their site, not a big issue this note just as an FYI to all)

    Not much better at 189.99.

    Sounds like you're not even gonna get kissed.....
    Last edited by a moderator: Aug 23, 2010
  9. Yea I'm going to pull the manager off this weekend see if there is any bare wires before I shell out that kind of dough.

    gmpartsgiant dot com GM Part 12511964

    Genuine GM HEATER,FU

    Retail Price: $199.44 Your Price: $139.26
  10. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    If wires are intact, I've used red RTV to re-insulate/isolate in the past, as a FYI you'll want a new o-ring for that as well that is a dealer procurable part, or IIRC Walking J may have some.
  11. Thanks Tim!

    Just got the call back from my local dealer stanadyn part # 31341 100 watt heater $62.00

    Still gonna check it out this weekend before I jump into anything, THX all!
  12. GM Guy

    GM Guy Manual Trans. 2WD Enthusiast

    May 6, 2008
    NW Kansas and SC Idaho
    I thought the OEM FFM was a Racor unit? that may explain why stanadyne wasnt much help. I misunderstand stuff frequently, so please ignore this statement if I am wrong.
  13. buddy

    buddy Active Member

    Nice, Stanadyne is less than half the price as online GM parts.

    while youre in that FFM, see if there is a corkscrew piece inside the central fuel input shaft. The heater slides up into this shaft into the corkscrew thing. If the screw thing is there just push/pull it out as its a restriction for fuel pressure.
  14. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    http://www.stanadyne.com/view.php?id=26 top right corner picture, our FFM is a Stanadyne item
  15. Ok so how much risk or potential danger am I taking by operating this with the fuel heater unplugged?
  16. NVW

    NVW Well-Known Member

    May 5, 2008
    Castor, AB.
    Until your temps are below freezing you're good.
  17. GM Guy

    GM Guy Manual Trans. 2WD Enthusiast

    May 6, 2008
    NW Kansas and SC Idaho
  18. WarWagon

    WarWagon Well it hits on 7 of 8...

    Nov 15, 2009
    I imagine the purpose of the corkscrew thing is like the corkscrew in a gas hot water heater to put the hot gas near the water tank side instead of the hottest gas going straight up the center. In other words this is transferring more heat from the heater to the fuel and making sure fuel flow past it is all evenly heated and gel wax flakes completely melted.
  19. Ahhh...

    Guess it's time for me to get reading & edgemacated about the FM & all it's quirks.

    Prolly should do the FTB mod while I'm in there...hey?

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