1999 Dodge Ram no power to fuel pump

Tiny
LEGENDWOLF
  • MEMBER
  • 1999 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 42,000 MILES
Started truck to warm up, shut off after about 5 min. Would not start back, no sound of fuel pump priminng. Could not find a fuel pump fuse, but swapped pump relay out with other relay's, still no fuel pump priming. Checked for power to relay with key on and off checked out ok. Suspect bad fuel pump, replaced with new Bosch fuel pump. Still no fuel pump priming. Know suspect electrical problem but don't know where to look.
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Friday, December 12th, 2008 AT 8:27 PM

11 Replies

Tiny
RASMATAZ
  • MEMBER
At the fuel pump relay backprobe the dark green and black wire when key at run positon-You should have power -let me know
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Friday, December 12th, 2008 AT 8:54 PM
Tiny
LEGENDWOLF
  • MEMBER
Have power at relay, but not at pump connection
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Saturday, December 13th, 2008 AT 3:49 PM
Tiny
RASMATAZ
  • MEMBER
Did you get that power from the dark green and black wire at the relay? This wire powers the pump
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Saturday, December 13th, 2008 AT 4:40 PM
Tiny
LEGENDWOLF
  • MEMBER
Took top off of relay, I can manually close the connection at the relay and fuel pump will run.
I am getting power to relay from key switch, but not sure about signal from PCM.
What would keep PCM from signaling fuel relay?
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Saturday, December 13th, 2008 AT 8:07 PM
Tiny
RASMATAZ
  • MEMBER
The computer control of the relay is defective-listen to the relay while helper turn key to run-did it click if not its no good.
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Saturday, December 13th, 2008 AT 9:52 PM
Tiny
LEGENDWOLF
  • MEMBER
Relay does not click when key is turned on, it's a good relay.
Is computer control BAD?
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Sunday, December 14th, 2008 AT 11:31 AM
Tiny
RASMATAZ
  • MEMBER
Its gone-unable to energize the fuel pump relay-it has to activate the relay in order for the fuel pump to receive power
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Sunday, December 14th, 2008 AT 11:40 AM
Tiny
LEGENDWOLF
  • MEMBER
Sounds expensive to replace.
Truck will run when I manually signal the fuel pump, Is there any way to confirm computer is bad?
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Sunday, December 14th, 2008 AT 12:20 PM
Tiny
RASMATAZ
  • MEMBER
Take it in to the dealership have them test it
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Sunday, December 14th, 2008 AT 5:05 PM
Tiny
LEGENDWOLF
  • MEMBER
Thanks for your help Rasmataz.
Great site Quick response, plan on donating.
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Sunday, December 14th, 2008 AT 5:57 PM
Tiny
RASMATAZ
  • MEMBER
Sir-We try to assist everyone that comes for help expediously cuz there's so many of you. You're always welcome aboard. Good Luck and Merry Christmas and Happy New 2009 and a prosperous one-
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Sunday, December 14th, 2008 AT 8:07 PM

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