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

Lift Pump Symptoms

Old Aug 30, 2010 | 05:34 PM
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Default Lift Pump Symptoms

what happens when its going out? my truck started sputtering then it got to where when you put it in drive it idles rough i changed my fuel filter just a few ago and it was half full of fuel shouldnt it be full? how hard or long does it take to change the lift pump? whats to it?
 
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Old Aug 30, 2010 | 07:00 PM
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Its going out you need to change it asap you dont ever want to run it long periods of time its not good at all on your pump i would suggest an upgrade to an airdog their the best
 
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Old Aug 30, 2010 | 08:53 PM
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i put a post up about our lift pump about a week ago, you should check it out because mine was doing the same as yours. its called truck would not start, figured out the problem.
 
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Old Aug 30, 2010 | 10:36 PM
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is it the original pump? how many miles are on it?
 
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Old Aug 31, 2010 | 01:38 PM
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no it was changed a while ago a year or two
 
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Old Aug 31, 2010 | 01:46 PM
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The only way to know what a fuel pump is doing is with a fuel pressure gauge.
 
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Old Aug 31, 2010 | 04:09 PM
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it tricky to swap out lift pumps? any tricks or it straight forward bolt of bolt on
 
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Old Aug 31, 2010 | 04:27 PM
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2 bolts, 2 line connections, piece 'o cake.
 
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Old Aug 31, 2010 | 08:07 PM
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do you have to prime it or some thing? just pump it then crack injectors or what?
 
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Old Sep 1, 2010 | 06:44 AM
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You may or may not have to prime anything. Just change it and crank, see if it fires.
 
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