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2002 Oldsmobile Bravada Fuel pump

Tiny
JEREMY896
  • MEMBER
  • 2002 OLDSMOBILE BRAVADA
  • 114,000 MILES
Car will crank and start if I use starting spray but I am not getting any power to the fuel pump. Replaced the pump and it still won't get power to it. Also the fuel pump relay sounds like its kicking our and not letting the power go back to the fuel pump. I am stumped at this point what's the problem and how do I fix it? Also would it be safe to bypass the relay and run my own power from the batt. Using a fuse and toggle switch or would that destroy the truck
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Sunday, September 15th, 2013 AT 5:41 AM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check to see if poer is going to an d from relay, switch relays with a like relay and see if it works. Then check the gray wire going to fuel pump it ma be shorting out. You shouldn't bypass the pump for safety reasons.
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Sunday, September 15th, 2013 AT 8:12 AM
Tiny
JEREMY896
  • MEMBER
  • 6 POSTS
Ok I won't bypass the relay but I did change it with one of the same kind and that one kicks out also. I do have power going to the relay but it kicks off so that there's no power going to the pump
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Sunday, September 15th, 2013 AT 10:06 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then the relay isn't making contact in the fuse box or the wire is shorted on the frame someplace I would try to back track the wire and see if it's shorted out or check from the fuse box. Also check the ground for the relay it's on the rh side of rear head.
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Sunday, September 15th, 2013 AT 10:19 AM
Tiny
JEREMY896
  • MEMBER
  • 6 POSTS
Ok I will do that soon as I get home. I was also told that the pass lock system could be preventing the fuel system to work is this also true and if so how do I reset the pass lock system because the truck was fine until I changed the valve cover gasket. I think moving all those wires may have done something because it ran until I cut it off and it hasn't started since.
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Sunday, September 15th, 2013 AT 10:47 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
See pic for reset it's pretty easy.
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Sunday, September 15th, 2013 AT 10:50 AM
Tiny
JEREMY896
  • MEMBER
  • 6 POSTS
Hey that seems to have worked, the truck is now running but it's missing really bad check engine light is on. It stays steady for a minute and then it flashes for a few then goes back to steady. Could I have messed up a sensor by using that starting fluid? I put in 6 new plugs and the miss is still there. I've also made sure everything is plugged in properly thanks for your assistance you've saved me a lot of money and time.
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Monday, September 16th, 2013 AT 2:49 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuelpressure with a guage auto parts scan for free if it's ap0300 that is a misfire and are very hard to diagnose. So have a pro do it.
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Monday, September 16th, 2013 AT 6:07 AM
Tiny
JEREMY896
  • MEMBER
  • 6 POSTS
Thank you again, had it scanned and its a misfire in the number one cylinder, I pulled the plug and its oil filled the others are dry if I can't find a non fouling plug it's time to take it to the shop as you've said. Wonder why it's wet?
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Monday, September 16th, 2013 AT 1:40 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Cold be a few things, a valve seal, low compression an injector leaking, or a piston/ring problem.
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Monday, September 16th, 2013 AT 3:01 PM

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