Question about 1998 Oldsmobile Bravada

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98 olds bravada

Mechanic says fuel pump wont shut off, even with the relay pulled. Is this common, also is the oil pressure switch a possible cause for this?

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If the relay is pulled, the fuel pump should not be running. If the mechanic is right, there is a short and your pump is getting electricity from somewhere it shouldn't. If that's not the case, the mechanic could be wrong. Post what the original problem was as a comment please.

Posted on Dec 31, 2008

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Bravada starts fine but for short trips will not restart after turning engine off. Just cranks but wont turn over. Takes 3 or 4 tries then starts. Any answers?


I would suspect the problem is the fuel pump. It is located inside the fuel tank. Next time this happens have a spray can of starting fluid with you, spray it into the air intake of the engine and see if it starts right up, if it does you likely need to replace the fuel pump.

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Do you have power going to the pump from the relay when you turn the key on ?
You should be able to jumper the relay and power the pump to test pressure.
If you have normal fuel pressure it may be an injector problem.

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I'm guessing from your short statement that you are not getting fuel. Your '93 would have either the 2.8 or the 4.3 v6. If your not getting fuel, check the fuel pump relay, look for a blown fuse. Disconnect the oil pressure sensor and jump across the connector terminals and try to start the engine. If the oil pressure sensor is bad, it will shut the fuel pump off.

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sounds like fuel pump relay. next time it want start pull the ecm bat fuse for a few seconds see if it will crank then. knock sensor will not cause this. ecm bat fuse it works the fuel pump relay,fuel pump,injectors,ignition system an the pcm. also the oil pressure switch will shut down the fuel pump if oil pressure drops below recommended pressure . check the connectors on these things that not loose or corrioded.i think you will find the fuel pump relay is what this relay is the problem. this relay maybe in dash or under hood in the relay box.

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Oil pressure switch puts power to the pump after it is started.

Pumps also tend to loose their ground with age. I often splice in a new ground at the pump to eliminate that problem area.

Need some votes, thanks

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My 1986 cadillac deville cranks over but wont start what could it be?


It should be either no Spark or no Fuel.
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Replaced the fuel pump & main relay. but the


First of all, why do you think it is fuel at all, since it could be the ignition?
Second is that if the car shuts down, how do you know it is not simply a clogged fuel filter?
A bad pressure return regulator can blow out fuel pumps by causing the pressure to be so high the pump over works itself.

I suggest you need better data.
A fuel pressure gauge would be nice.
You could improvise one out of a cheap mechanical oil pressure gauge. You could also run some long thin wires to the fuel pump relay output or even to the pump itself, and hang a little LED off the dash as a temporary diagnostic indicator light.
To catch an intermittent, you need constant data.

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You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off

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1 Answer

Fuses


The first thing you should do is to locate the oil pressure switch/sending unit.

This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.

===

When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM2 fuse blow is because the harness is grounding/shorting.

===

DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.


Please post up day on the comment window/page.

I will follow up on it later.


Good luck.

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