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Not getting power to the fuel pump

Tiny
ERICHAMPTON
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 138,000 MILES
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
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Tuesday, September 21st, 2010 AT 8:15 PM

30 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
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Tuesday, September 21st, 2010 AT 10:29 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
The fuel pump fuse is in the relay panel under right side of dash. 20amp fuse we enjoy your feedback
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Wednesday, September 22nd, 2010 AT 7:52 PM
Tiny
SANCHEZDANNY
  • MEMBER
  • 3 POSTS
  • 1999 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 10,015 MILES
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?
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
SANCHEZDANNY
  • MEMBER
  • 3 POSTS
Correction that car has 115000 miles.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
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.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
SANCHEZDANNY
  • MEMBER
  • 3 POSTS
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?
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
GENNIFERJOHNSON
  • MEMBER
  • 1 POST
  • 1998 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 103,777 MILES
Can a fuel pump relay or fuse cause fuel from flowing to engine
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
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.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
DAVELAWRENZ
  • MEMBER
  • 1 POST
  • 1998 CADILLAC DEVILLE
Electrical problem V8 Two Wheel Drive Automatic

power works for a few seconds on one side but other side has no power.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
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.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
MARLYMAR510
  • MEMBER
  • 1 POST
I changed the fuel pump relay and fuse and I’m still not getting any fire to the plug ! What should I do
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,633 POSTS
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
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
PAGE DENNIS
  • MEMBER
  • 1 POST
  • 1997 CADILLAC DEVILLE
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.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the computer fuel pump control circuit of the relay, also check the oil pressure sending unit.
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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
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

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Saturday, May 23rd, 2020 AT 11:44 AM (Merged)
Tiny
MIRIAM CUERDA
  • MEMBER
  • 1 POST
  • 1996 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
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?
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Saturday, May 23rd, 2020 AT 11:45 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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.
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Saturday, May 23rd, 2020 AT 11:45 AM (Merged)
Tiny
PANDLMCDANIEL
  • MEMBER
  • 2 POSTS
  • 1993 CADILLAC DEVILLE
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
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Saturday, May 23rd, 2020 AT 11:45 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It suppose to prime the engine for 2 secs-check the fuel pressure with a gauge and comeback with the readings
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Saturday, May 23rd, 2020 AT 11:45 AM (Merged)
Tiny
PANDLMCDANIEL
  • MEMBER
  • 2 POSTS
I am getting good pressure for the 2 seconds 44# but no fuel after the frist brust of fuel.
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Saturday, May 23rd, 2020 AT 11:45 AM (Merged)

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