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Thread: Fuel relay

  1. Top Of Page | #1
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    Fuel relay

    2004 5.9 with in tank fuel pump. Looking for some input on this fuel relay. It crapped out once before leaving me stranded with a 40ft RV in tow about 3 months ago. Never had any issues with this before then. Had it replaced and ordered a spare which I had to use today because it did it again. Thoughts?



    Sent from my XT1254 using Tapatalk


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    Old & Grumpy! Polaraco's Avatar

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    Fuel pump may be going bad. It is drawing too much current burning out the relay. Do you have a fuel pressure gauge?


    2003- 3500 RWD Automatic.
    S & B intake, BD Intercooler, Pusher Air Horn, MM3 Double R Tuning, Turbo Timer, electric Flex-a-lite fans, FASS 95,
    50 HP tips, upgrade to 351 turbo, 3.42 gears, Twin air compressors, air bags, Remote dual oil filters, Hellwig sway bar, Front Winch. Home made Fuel Heater, BD Exhaust brake with Torque Lock. Tons of TLC

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    I don't have a gauge. New airtex pump about 3 months ago. Is there a method to test the pump?

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    Old & Grumpy! Polaraco's Avatar

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    Quote Originally Posted by Augie View Post
    I don't have a gauge. New airtex pump about 3 months ago. Is there a method to test the pump?

    Sent from my XT1254 using Tapatalk
    Yes there is, but you need the tools. A digital DC amp probe will tell if the pump is drawing too much current. I don't think the 04 will give you fuel pressure from the computer so a pressure gauge will be needed. Take a look at the fuel pump fuse. look to see if it's getting hot but not blowing.

    It could be just a fluke too. Maybe the new relay just died.


    2003- 3500 RWD Automatic.
    S & B intake, BD Intercooler, Pusher Air Horn, MM3 Double R Tuning, Turbo Timer, electric Flex-a-lite fans, FASS 95,
    50 HP tips, upgrade to 351 turbo, 3.42 gears, Twin air compressors, air bags, Remote dual oil filters, Hellwig sway bar, Front Winch. Home made Fuel Heater, BD Exhaust brake with Torque Lock. Tons of TLC

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