not getting power to the fuel pump

1999 CADILLAC DEVILLE
138,000 MILES • V8 • FWD • AUTOMATIC
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ERICHAMPTON
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hey i was working on a 1999 caddy deville and replace fuel pump and not getting any fire to the fuel pump. I checked all the relays and the fuse under the hood is there another relay that is some where esle on the car, aiso check the fuses in the trunk , i test the relays with a test light and where the fuel relay goes their is no fire there. dont see any crack wire or any thing do the oil sending unit has any thing to do with that
Sep 21, 2010 at 8:15 PM
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RASMATAZ
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Check the fuel pump relay socket pink wire if there's power nothing here and the fuel pump fuse is good the pink wire is open between the fuse and relay socket
Sep 21, 2010 at 10:29 PM
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CADIEMAN
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the fuel pump fuse is in the relay panel under right side of dash. 20amp fuse we enjoy your feedback
Sep 22, 2010 at 7:52 PM
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SANCHEZDANNY
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ran out of gas on 1999 deville, will not start. changed fuel pump and filter. not getting power to fuel pump. cannot locate fuel pump relay. can you help?
May 23, 2020 at 11:44 AM (Merged)
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SANCHEZDANNY
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correction that car has 115000 miles.
May 23, 2020 at 11:44 AM (Merged)
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FACTORYJACK
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The fuel pump relay is in the underhood fuse block, in front of the left front(driver) strut tower. It is either under the flap that provides access to the mini fuses, or you need to remove the plastic cover. There will be a sticker on the underside of the cover, the legend for the fuse relay center.
May 23, 2020 at 11:44 AM (Merged)
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SANCHEZDANNY
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found it guys, Thanks! I tried to swap the replays but still won't start. need to have a mechanic trouble shoot the electrical sys. a neighbor said the fuel pump has no power. might be a modulator?
May 23, 2020 at 11:44 AM (Merged)
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GENNIFERJOHNSON
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can a fuel pump relay or fuse cause fuel from flowing to engine
May 23, 2020 at 11:44 AM (Merged)
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BLUELIGHTNIN6
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yes, if fuel pump relay or fuse is bad then it will not let the fuel pump get power to be able to pump fuel to engine..
May 23, 2020 at 11:44 AM (Merged)
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DAVELAWRENZ
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Electrical problem V8 Two Wheel Drive Automatic

power works for a few seconds on one side but other side has no power.
May 23, 2020 at 11:44 AM (Merged)
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FACTORYJACK
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The few seconds is normal as the ECM controls the relay to build rail pressure in anticipation of cranking. Check the fuel pump fuse in the underhood fuse center. If it is blown, you could have a short, but it is more probable that the fuel pump has high resistance and is drawing too many amps and opened the fuse.
May 23, 2020 at 11:44 AM (Merged)
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MARLYMAR510
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I changed the fuel pump relay and fuse and I’m still not getting any fire to the plug ! What should I do
May 23, 2020 at 11:44 AM (Merged)
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STRAILER
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hello,

Here is a wiring diagram that show where the power is coming from which looks like a fuse. Here is a guide on how to check for power

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below)

Please let us know what you find.

Cheers, Ken
May 23, 2020 at 11:44 AM (Merged)
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PAGE DENNIS
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Electrical problem
1997 Cadillac Deville V8 94000 miles

My 97 cadillac Deville shut down while driving and i had the fuel Pump replaced. but the problem is that i can not get fire to the fuel pump. a gas rag at the throttle body will start the car until the fumes runs out i replaced the relay and checked all fuses and cannot get fire to the tank.
May 23, 2020 at 11:44 AM (Merged)
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RASMATAZ
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Could be the computer fuel pump control circuit of the relay, also check the oil pressure sending unit.
May 23, 2020 at 11:44 AM (Merged)
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ZACKMAN
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Do this diagnostic. You will need a DVOM (Digital Volt/Ohm Meter for this.


https://www.2carpros.com/forum/automotive_pictures/55316_97devillefuelpumprelay2_1.jpg


https://www.2carpros.com/forum/automotive_pictures/55316_97devillefuelpumprelay_1.jpg

May 23, 2020 at 11:44 AM (Merged)
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MIRIAM CUERDA
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my 1996 Cadillac Sedan Deville is not pumping gas into engine, I have change the battery and the fuel relay and now there is no curint going to the relay. What could be stopping the curint from going into relay?
May 23, 2020 at 11:45 AM (Merged)
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JACOBANDNICKOLAS
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If there is no power to the relay, check to make sure the wiring under the relay block hasn't come loose. If it is good, you need to trace the wiring until you find where the break is located.
May 23, 2020 at 11:45 AM (Merged)
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PANDLMCDANIEL
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Engine Mechanical problem
1993 Cadillac Deville V8 Front Wheel Drive Automatic

Car just died and now will not start. Will crank over but now fire. Pulled the fuel line to make sure getting fuel but only get pressure for 2 seconds then no fuel. Would this be the pump or maybe the relay??? Thanks for the help
May 23, 2020 at 11:45 AM (Merged)
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RASMATAZ
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It suppose to prime the engine for 2 secs-check the fuel pressure with a gauge and comeback with the readings
May 23, 2020 at 11:45 AM (Merged)
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PANDLMCDANIEL
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I am getting good pressure for the 2 seconds 44# but no fuel after the frist brust of fuel.
May 23, 2020 at 11:45 AM (Merged)
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FACTORYJACK
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That is normal to build rail pressure, if there is no continuing rpm signal the pump is shut down. You have only checked one avenue. You need to check spark, and if you have spark, check that the injectors are firing.
May 23, 2020 at 11:45 AM (Merged)
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POPROCKS6301
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i have got a 1983 Cadillac Coupe Deville and I am having trouble with the fuel pump. when i go to start the car it really wants to turn over, but the fuel pump won't turn pump gas to the engine. But if i put gas in the carberator then it will try to run off the gas i put in the carbirator.
we have gotten it once to run off the gas i put in the carbirator. i am debating if it is the fuel pump, fuel pump relay, or a blown or missing fuse. the problem comes, because i don't know which relay is which. can someone please give me some suggestions on this subject?
May 23, 2020 at 11:45 AM (Merged)
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ASEMASTER6371
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do a fuel pressure check. in most cases, it is the fuel pump itself that has failed.

Roy
May 23, 2020 at 11:45 AM (Merged)
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POPROCKS6301
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OK THANK YOU I WILL LOOK INTO THAT
May 23, 2020 at 11:45 AM (Merged)
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CADIEMAN
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i had the same car back in my cadie yrs. do u hear the pump run when u first turn the key on?drop the r/side under dash panel.u will see a relay panel with fuses in it.there is a 20 amp. mini fuse their marked fuel pump.use a test light or volt meter to check that voltage is there and the fuse isnt blown.we can start here.kk
May 23, 2020 at 11:45 AM (Merged)
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POPROCKS6301
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ok thanks cadieman. i will look into that and tell you the results when i can thank you. it might be a week or so before i can do it cause im busy so please keep watching for my reply
May 23, 2020 at 11:45 AM (Merged)
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CADIEMAN
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np gl ill be here.
May 23, 2020 at 11:45 AM (Merged)
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POPROCKS6301
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hey cadieman. I am sorry I have not replied in a while. ive been working on my 1983 Cadillac Coupe Deville. I changed my fuel pump.
It actually runs now. but I have 1 question. how do I clean the digital fuel injectors in the throttle body?
May 23, 2020 at 11:45 AM (Merged)
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CADIEMAN
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add Lucas fuel system cleaner. He
May 23, 2020 at 11:45 AM (Merged)
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POPROCKS6301
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ok i will cadieman. thank you for your help. we are still working on the car. lol
May 23, 2020 at 11:45 AM (Merged)