OK, I'm baffled. Bad fuel pump? relay? something else? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-02-2009, 01:56 PM   #1
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Default OK, I'm baffled. Bad fuel pump? relay? something else?

My 94 Bonneville has been doing pretty good for a while now then it decided to start acting up yesterday. The fuel pump does make a humming sound but it has done that for as long as i can remember. So, I don't know if that is normal or if it'* a sign that it'* about to go out.

Anyway, my wife took the car from work to the baby sitters yesterday (about a 7 mile trip). When she picked up our son the car wouldn't start. It just cranked over as if it was getting no spark or no fuel. So we left the car at the baby sitters overnight and i went back today to see if i could tinker with it.

I jumped in and it fired right up. I drove it home which was about 11 miles and it seemed to be fine all the way. I let it sit in the driveway for a few minutes and then tried to start it to see if the same thing would happen. Sure enough, it just cranks over but won't start. Anybody know what this could be?

By the way, the car has 198,000 miles on it. I'll probably just try to find a different car because this one seems to be on it'* last leg. Any advice is appreciated.
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Old 10-02-2009, 02:02 PM   #2
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Had one member with a similar problem, and it was a clogged fuel filter. If it hasn't been changed lately, change it. $10 for the part and half hour of your time. If that doesn't work, get the fuel pressure checked at the schraeder valve on the fuel rail in the engine compartment and come back with the results. I only mention this because of your comment about the fuel pump noise.

Sounds more like a problem with the crank shaft position sensor than a fuel problem. Have you checked for DTC'*. When did you last change plugs, wires, etc.?

Last edited by 2kg4u; 10-02-2009 at 02:06 PM. Reason: sp
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Old 10-02-2009, 02:02 PM   #3
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That sounds like a VATs problem. Clean the key or bypass the VATs. https://www.gmforum.com/t279119/
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Old 10-02-2009, 02:09 PM   #4
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Dan knows far more about this than I do. Start with his suggestion.
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Old 10-02-2009, 02:28 PM   #5
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Quote:
Originally Posted by 2kg4u
Dan knows far more about this than I do. Start with his suggestion.

Quote:
Originally Posted by Danthurs View Post
That sounds like a VATs problem. Clean the key or bypass the VATs. https://www.gmforum.com/t279119/
I was wondering if that might be a possible problem. I know the fuel filter is good because i just replaced it 8 months ago and there is a brand new Crank sensor on it. I'll give the VATs solution a shot. Thanks!
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Old 10-02-2009, 02:31 PM   #6
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In 94 if the VATS was triggered the starter will not engage.
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Old 10-02-2009, 02:35 PM   #7
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Ahh, News to me.

OK, need to test for spark, and do a fuel pressure test, then move on from there.
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Old 10-02-2009, 03:34 PM   #8
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Possibly ignition module?
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Old 10-02-2009, 03:56 PM   #9
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Yes, a slight problem with my 94 on the VATS side... security light comes on and it acts like theres no starter, it wont turn over at all... so thats not it... but the Ignition Module is a possibility.

Fuel Pump is too. With the fuel pump whining like it is, mine NEVER did... it just lost pressure after driving and warming up, Id say the pump may be actually going out. Check the pressure on a cold start, then drive it, let the pump warm up and check the pressure again, if it drops off then the pump is the problem

If its less than 40psi then look at replacing it

just 2 pennies
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Old 10-08-2009, 02:21 PM   #10
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Lightbulb

You have tried clear-flood mode, ie. gas pedal to the floor?...this sounds a lot like what I just
went thru on my '94 with 181k and a leaking fuel pressure regulator - had to clear-flood when hot, I
never tried just cranking it without my foot on the floor but I know it would have cranked a LOOONGGG
time like that.

Then, if you let it sit ( a day/days) it would start instantly after the fuel evaporated out of the intake...

Just a thought in addition to the fuel pump / ignition module which are also good possibilities...
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