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no power to fuel pump on 97 suburban

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Sep 11, 2008, 5:50 PM

Post #1 of 5 (1564 views)
post icon no power to fuel pump on 97 suburban Sign In

i have a 97 suburban that has no power to fuel pump, has power to relay box, the service station cant figure it out, they did get it to run when they hot wired the fuel pump off a separate battery, any help would be great, could it be the oil pressure switch?they have power there too.


Apr 21, 2009, 8:21 PM

Post #2 of 5 (1457 views)
Re: no power to fuel pump on 97 suburban [In reply to] Sign In

i'm sure on yours but if you have a black box on fire wall pass. side that's were the fuel pump fuse is on trucks


Apr 22, 2009, 6:14 PM

Post #3 of 5 (1447 views)
Re: no power to fuel pump on 97 suburban [In reply to] Sign In

Do you have spark?The computer will not supply battery voltage to control side of relay unless ignition pulses are received.That would mean no spark or fuel pressure.If you have spark and no fuel pressure let me know.If fuel pump relay was bad then the fuel pump/oil pressure sender switch would be a back up and truck would still start but have a extended crank condition because the contacts on the switch would wait until oil pressure reaches around 4psi to close and provide voltage directly to fuel pump bypassing the fuel pump relay all together.


Apr 22, 2009, 6:15 PM

Post #4 of 5 (1445 views)
Re: no power to fuel pump on 97 suburban [In reply to] Sign In

What size engine? If fuse was bad there would be no power to relay on the power side of relay which there is as stated in the original post.

(This post was edited by autojoe on Apr 22, 2009, 6:22 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 23, 2009, 7:31 AM

Post #5 of 5 (1423 views)
Re: no power to fuel pump on 97 suburban [In reply to] Sign In

Guess: It's a 5.7 and has a four wire oil gauge with w pink wire there. Just toss it - near oil filter on that engine,

Long retired now


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