12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

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Old 03-06-2010, 10:38 PM
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Hello all,

Have a question...

My Fuel Gauge is acting up. tank is full, sometime it reads full, and when driving it goes to empty then to 1/4 tank and back to empty.

Is this a sending unit problem? do i gotta replace the whole sending unit or and plug issue?

Thanks
 
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Old 03-06-2010, 11:21 PM
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make sure the plugs gotta good connection!!
 
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Old 03-07-2010, 02:33 PM
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that would be the sending unit but make sure as said above that you are getting a good connection everywhere
 
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Old 03-07-2010, 02:41 PM
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mine does that to. where is the sending unit and witch connections do you check? is it the one on top of the tank?
 
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Old 03-07-2010, 04:25 PM
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it would be on top of the fuel tank, but im not sure which connections, i suppose check em all would be a good idea
 
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Old 03-07-2010, 04:43 PM
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Check the connection on top of the tank, make sure it is good, but we have seen a lot of these trucks act like that, we had to replace the sending unit in the tank, but i would start with the simple stuff first before you start replacing.
 
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Old 03-07-2010, 06:20 PM
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Mine was doing this it was the connection ontop of the tank.
 
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Old 03-16-2010, 08:41 PM
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are you able to just replace the connection on the top? i called autozone, pepboys, orielliy, and napa and was told i have to replace the whole pump and it would range anywhere from 200-400 just for the item....

---AutoMerged DoublePost---

btw the gauge starts working after i wiggle the wire and elbow but stops after i drive it or hit a bump
 

Last edited by kayden101; 03-16-2010 at 08:41 PM. Reason: Automerged Doublepost
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Old 03-16-2010, 08:59 PM
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Originally Posted by kayden101
are you able to just replace the connection on the top? i called autozone, pepboys, orielliy, and napa and was told i have to replace the whole pump and it would range anywhere from 200-400 just for the item....

---AutoMerged DoublePost---

btw the gauge starts working after i wiggle the wire and elbow but stops after i drive it or hit a bump
you shouldnt have a pump in your tank anyways. you should have a lift pump on your block or something in line. it should be strictly a sending unit not a pump.

and judging by the second half of that statement, sounds like you got a wiring problem there.

get it to get a solid conneciton. if you absolutely have to, splice a wire to bypass the connector for the wire thats losing connection. that will at least tell you if thats whats really wrong with it or not
 
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Old 03-16-2010, 09:55 PM
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ok ill give the wiring a try.... so your saying the whole unit thats inside in the fuel tank is the sending unit?

sorry am a little confuse...

thx in advance
 


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