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

Hardly any fuel to #1 cylinder

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Old Aug 19, 2010 | 10:57 PM
  #1  
1stGen1990's Avatar
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From: Powell Butte, Oregon
Default Hardly any fuel to #1 cylinder

At work our 94 5 speed started missing today, had a fuel leak so we thought it was sucking air. Fixed it and bled the lines, still had it. We noticed the line to #1 had barely any fuel pressure at any rpm while the other 5 would squirt everywhere when cracked open. We also put on a new lift pump as well, it would die between shifts after pulling hard. Any idea why the injection pump aint puttin out much fuel on only 1 cylinder? Thanks
 
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Old Aug 20, 2010 | 12:20 PM
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stevenbrazell's Avatar
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clogged injector?
 
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Old Aug 20, 2010 | 12:52 PM
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Farmboy 2.0's Avatar
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Try taking the fuel line all the way off and blowing air through it. Just and idea that might be worth a shot
 
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Old Aug 20, 2010 | 08:15 PM
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95cumminsguy's Avatar
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I would bet the plunger and barrel in the injection pump is bad, how many miles does that truck have on it?
 
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Old Aug 20, 2010 | 09:54 PM
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Red_Rattler's Avatar
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X2 to plunger being wore out
 
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Old Aug 20, 2010 | 10:30 PM
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white93's Avatar
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Does the throttle get stiff when its acting up?
 
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Old Aug 21, 2010 | 05:18 PM
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12valvetater's Avatar
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Plunger is siezing in the barrel. Classic effect of extended time with low fuel pressure.
 
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Old Aug 22, 2010 | 05:30 PM
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1stGen1990's Avatar
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That makes sence because it was ran a while before they realized the fuel pump was out, i'll pull parts off our junker dodge to see. Its got a little over 200,000 miles. So does it need a new plunger to?
 
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