Question about 1989 Cadillac Sedan DeVille

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1996 Seadan Deville 4.9L fuel pump stopped.

No pressure on fuel rail valve.relays and fuse sound from pump when key turned.Is there an access panel under the backseat,and how do I remove the seat bottom? (I hate to remove the tank)

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Before changing or adding a fuel pump I would check for power getting to the pump connector. I believe this model has an inertia switch in the trunk which if for some reason got tripped it will break the power to the fuel pump not allowing it to come on (a safety device in case of an accident) also if you have an air ride leveling system which was common on these vehicles there is actually a fuel cut off switch inside the trunk area. You usually can access the plug-in to the fuel pump connector from the underside of the car without dropping the tank.

Posted on Jul 04, 2009

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I would purchase and install an electric fuel pump or have one installed. Simple to install, attach to side of car, place in fuel ine and place black wire to battery, only problem, the pump starts pumping immediately when engine is turned on and in case of an accident, it will not shut off as long as the motor is running.

Posted on Jun 28, 2009


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1999 chrysler 3.5 lhs fuel not going to injectors

Then your fuel pump is not working, or your fuel filter is blocked. You will probably have to check your fuel pump circuit if you have no fuel pressure in the fuel rail, where the injectors sit. There is a fuse for the pump, usually in the under hood fuse/relay block. That is probably also where the fuel pump relay is located. You should hear or feel this relay click when the ignition key is cycled from off to on. Also, when the key is turned to on, you should hear the fuel pump in the gas tank turn on for about 2 seconds. This will put the pressure in the gas in the fuel rail, for starting the engine. If you don't hear the pump turn on for that 2 second period, it is probably a bad fuel pump. But know the fuse is good first.

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Listen for the 2 second hum or buzz from the gas tank, when you turn the key to on, not start. The pump should run for about 2 seconds to put pressure in the lines and up to the fuel rail. If you don't hear it, first check the fuel pump fuse, usually in the under hood fuse/relay center. Or you could check for fuel pressure at the testing port-shrader valve- on the fuel rail. If you punch the center valve down with a small screwdriver, gas should try to spurt out. If no pressure, the pump is bad or the wiring to it needs to be investigated. Power flows from the battery to the fuse to the fuel pump relay and then to the gas tank. The relay is turned on by the pcm and allows the relay to pass power on to the pump.

Many parts stores rent or loan fuel pressure gauges to check your fuel pressure. The correct pressure is critical for the injectors to work right. If the car won't start, check fuel pressure and check for spark. Usually gas or spark is the problem.

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No Fuel Pressure

More likely the pump is not putting gas up to the engine's fuel rail.
With key on, not start, the pump should turn on for 2 seconds to put pressure in the line and fuel rail. Do you hear the buzz or hum from the tank with key on?
Did you put a fuel pressure gauge on the fuel rail's test port (shraeder valve), and find no pressure with key on? If so, you will need to check into the pump operation (assuming the fuel filter is not clogged). A quick test is to pull off the gas tank electrical connector, find the fuel pump wire in the connector, and use a test light grounded to a metal frame or a voltmeter. Check for power on the fuel pump wire, while the engine is being cranked over. If power then, your new pump is not working. It could be the ground for the pump, so you need to check that. If no power to pump, engine cranking, then you will have to find the fuel pump relay under the hood, and check the wiring to it. There is also a fuel pump fuse-it may be under hood or in the instrument fuse panel-need to find and check it.
If the pump is working and the fuel filter is clean, you should have gas in the fuel rail (which supplies the injectors with fuel under pressure). I have not heard of a pressure regulator problem that could cause no pressure, but then...
Post back what you find, or with comments. Hope this has helped a little.

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I have a 2001 Mazda protege. Has new fuel pump and pressure regulator, I have cleaned fuel tank , lines, rail, and injectors. Relays and fuses are good. I took breather off and sprayed fuel into throttle...

sounds like an electrical problem .pump isnt coming on .turn on key listen for fuel pump to come on for 10 seconds then shut off on its own. If you dont hear the pump then its probley fuel relay . next check wires are plugged into fuel pump. lots of cleaning ?? is the fuel rail screen plugged ???? disconnect before rail if the pump comes on next. turn on key check for fuel pumping out line .

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1991 eagle talon non turbo will turn over but wont start just replaced the computer in it and havent even drove it a mile my brother thinks its the fuel pump because u cant here it kick on when u first...

Hello, Joey, thank you for the direct question. Here is an easier more accurate way to troubleshoot your problem, other than the one proposed.

If the fuel pump is in doubt, check for fuel pressure at the fuel rail on right side of the engine. With the key in the run position you should have about 40 PSI. If pressure is present, but low, check for a restricted fuel filter and voltage at the connector, on top of the fuel pump. You should have 12 volts there. A lot of times a bad ground will cause a drop in voltage. The pump will still run, but will be weak. You should be able access it from under the backseat.

Another area to inspect is the CAS. If the ECU does not receive a signal the engine is trying to start or is running, it will not fire the fuel pump.
I hope this info was helpful & good luck with the Talon.

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1 Answer

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