I have a 2000 Dodge Dakota Quad CAB 24gal tank fuel problem- wiring don't kow

Tiny
MULTIBURON
  • MEMBER
  • 2000 DODGE DAKOTA
  • 256,000 MILES
.I have been having problems with the truck cutting out like no fuel. It would then work and I would be on my way! Well finally the pump died so I replaced it. Now only 16hrs after completing the project it just cuts out instantly. Turn it off back on it runs. I checked the fuel pump relay and it is stove hot I don't know if this is normal or not. I don't know where to start. Help is greatly appreciated!
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Thursday, December 8th, 2011 AT 9:46 PM

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Tiny
CARADIODOC
  • EXPERT
Sounds like the wire going to the fuel pump might be grounding out but that should be causing a fuse to blow. First swap the fuel pump relay with a different one like it. If the new one doesn't get hot, the contacts in the old one are likely pitted and the resistance is causing the heat buildup.

If the new relay gets hot, we'll need to measure the current going to the pump. I can walk you through that if you have a DVOM that can measure up to 20 amps.
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Thursday, December 8th, 2011 AT 10:14 PM
Tiny
MULTIBURON
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I already swap out the relay with another one and it does the same thing. I tried 5 different relays with the same result. I don't have the truck here but if you give me the details to trouble shoot I can do it first thing tomorrow.
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Thursday, December 8th, 2011 AT 10:29 PM
Tiny
CARADIODOC
  • EXPERT
The easiest way is to remove the fuel pump relay, then insert an ammeter in terminals 30 and 87 or the two shown with arrows. The pump will run even with the ignition switch off. Six to eight amps is about typical, as I recall.

You should also check the terminals in the relay socket for signs of overheating. Regardless of how much current is flowing, the contacts inside the relay should not get hot. Heat results from undesirable resistance between the contacts or from a poor connection between the relay's terminals and the terminals in the socket. Once that resistance develops it will affect any other relay that's plugged in there. Heat promotes a poor connection and a poor connection causes heat, so it's a vicious circle. Usually by the time it gets that bad you'll see signs of the plastic melting around the contacts.
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Thursday, December 8th, 2011 AT 11:12 PM
Tiny
MULTIBURON
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Yeah the power was over heating! I fixed the wire that was burnt. It was reading 5ish with the pump running. I put a different relay I had laying around and no problems yet. Its just weird that 5 different relays did the same thing!
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Sunday, December 11th, 2011 AT 5:55 PM
Tiny
RIVERMIKERAT
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Thread closing. No reply necessary.
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Monday, January 23rd, 2012 AT 8:26 AM

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