Fuel pump

Tiny
SHORTY18128
  • MEMBER
  • 1995 DODGE DAKOTA
  • V8
  • 4WD
  • AUTOMATIC
  • 289,000 MILES
I have a 95 Dodge dakota SLT 318 5.2 L I drove my truck all week and on Fri it had a 1/4 tank of gass and then I park it and then Sat morrning I got up to leave a went to start it and it would not start I don't hear the fuel pump is their another way to check to make sure it is the pump.
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Friday, December 10th, 2010 AT 5:48 PM

7 Replies

Tiny
WRENCHTECH
  • EXPERT
Sure there is. You would have to use a fuel pressure gauge and test light to follow a wiring diagram to test for power and ground arriving at the pump
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Friday, December 10th, 2010 AT 5:55 PM
Tiny
CARADIODOC
  • EXPERT
Bang on the bottom of the tank while a helper cranks the engine. Unlike GM pumps, Chrysler pumps rarely quit while driving. When the brushes in the motor are worn, they fail to start up. Banging on the tank often gets them started.

There is only voltage to the pump for one second after turning the ignition switch to "run", then again anytime the engine is rotating, (cranking or running), so banging on the tank is most effective during cranking.

Another test is to pop the cover off the fuel pump relay, reinstall it, and watch for a tiny spark when you squeeze and release the contact. No spark means most likely the brushes are worn and open circuited. A spark means the motor is trying to run but may be locked up. That was more of a full-size truck thing in real cold weather in the '90s. The pump bodies warped when cold. I never heard of THAT on a Dakota.

Caradiodoc
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Friday, December 10th, 2010 AT 6:02 PM
Tiny
DAVE'S BIG BACKYARD!
  • EXPERT
If you have no fuel pressure then you have to check the harness at the pump, unlike a g.M or a ford you cannot test them the same. To get power to the fuel pump you have to crank it as you test it. For this you need some help from someone.
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Saturday, December 11th, 2010 AT 2:06 AM
Tiny
WRENCHTECH
  • EXPERT
The Chrysler circuit works the same as Ford and GM. You get a 2 second prime when the key is turned on and then it re-powers when the PCM sees a tach signal.
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Saturday, December 11th, 2010 AT 2:11 AM
Tiny
SHORTY18128
  • MEMBER
Thanks for helping me find out what the problem was.

P.S Ground wires couse lots of problem THANKS AGAIN
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Wednesday, December 15th, 2010 AT 1:28 AM
Tiny
DAVE'S BIG BACKYARD!
  • EXPERT
Sorry I was thinking to far back on that one. Yes you will have power at key on, your right.
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Wednesday, December 15th, 2010 AT 1:51 AM
Tiny
WRENCHTECH
  • EXPERT
Closing out question
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Monday, March 28th, 2011 AT 6:58 PM

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