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fuel pump on a 98 deville d'elegance


98deville

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How hard is it to do this myself? and what brand fuel pump to go with. The reason I'm asking is cause my car doesnt want to start at all...the engine just keeps turning. and when the engine did kinda start it sputtered then cut off...any idea of what it could be.. and I have a 98 deville with 91k

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Put a fuel pressure guage on it and see what kind of fuel pressure you have (or don't have). It's in the tank so if you have to change it, you'll have to drop the tank.

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I've checked the fuses and relays they're all good I also opened the gas cap to listen if the fuel pump turns on and there's nothing I priced a fuel pump at advanced auto parts it was 298$ which was a carter brand

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If you pinpoint the problem to the pump and you're going to go to the trouble to do it yourself, I'd suggest you buy a GM pump as the replacement unless someone else on the board can vouch for an aftermarket unit.

Doing the work is not too bad as long as you make sure the tank is down to 3 gallons or less. Any more than this makes it a challenge to handle the tank as it's removed.

Make sure you pull the electrical connectors to the pump / fuel gauge loose before you loosen the tank brackets too much.

Keep us posted. :)

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I would use only a GM pump. Also I have found it easier to use a floor jack with a board on it under the tank for support while I loosen the straps. The strap bolts won't come off easy. Then lower it slowly just far enough to disconnect the wiring. Then check to see if anything else is connected then lower it some more and just roll it out from under the car. Put the car on jack stands or back the car up on some solid blocks or a stack of 2X8's for extra ground clearance. Do not empty the tank completely because it will explode easier. If you do it in a garage be careful about any open flames and do it in a well vented area. Use the floor jack again to reinstall. Make sure the tank is seated good before you tighten the straps.

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Here are the codes I pulled up

PCM

P0603 - Control Module Long Term Memory

IPC

B1552 - Keep Alive Memory Error

SDM

B1147 - Driver Side Air Bag System Malfunction

B1148 - Passanger Side Air Bag System Malfunction

TCS

C1255 - EBCM Internal Malfunction

PZM

B1552 - Keep Alive Memory Error

B1558 - BCM EPROM Checksum Error

all of these are HISTORY codes

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I replaced the FP on my seville last summer. when i checked the wire connector on the pump itself, I found a good bit of funky green scale. of course when you are holding a "good used" pump in your hand, with 100k miles of use, its probably not a good idea to put it back in. so i put in a new pump and chalked it up to life's usual quirks. I believe the tank on a seville can be accessed thru the trunk. not sure about a deville.

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Pressure test. Put a fuel guage on the schrader valve on the fuel rail...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I also took off the fuel filter to replace it, and there was no gas coming from the fuel line when i turned the key. I also tried to blow thru the old filter and it was clogged bad.

here are some codes I had months ago

P0102 - Mass Air Flow (MAF) Sensor Circuit Low Frequency

P0231 - Fuel Pump Feedback Circuit Low Voltage

P0463 - Fuel Level Sensor Circuit High Voltage

P0603 - Control Module Long Term Memory Reset

P1660 - Cooling Fan Control Circuits

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They are hard to blow though, don't let that be an indication that it was clogged

That you didnt get fuel when you turned the key on, is not good. Before you go to the trouble of replacing the pump I would, 1) check the fuel pump relay and 2) check for power at the fuel pump connector when you drop the pump and disconnect the wires.. If you have power with the key on, then its the pump. Do this test with the hoses and pump in place so NOT to have gas FUMES in case of a spark...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I am a big Carter fan from the old days (AFB was my favorite and an OEM carburetor on old Cadillacs), but this is another instance where you are safer with an AC DELCO OEM pump as others have said.

Again, OEM has been validated for your car and how long did this one last? When you start talking out there, TONS of cars are having fuel pumps replaced. My grandmother had a pump go in a 2000 Taurus last week at 23,000 miles, when I called ford the service manager said its common, he just replaced two on 2004 Explorers..

I want to make sure that 1) the correct insulation is used on the coil, 2) it can provide proper volume at all engine output levels

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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