Having fuel or elect. problems???? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 08-20-2010, 05:51 AM Thread Starter
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Having fuel or elect. problems????

Truck will randomly cut out for a split second under a load. No load it wont do it unless i cram her thru the floorboards. I have heard everything from bad crank sensor, cam sensor, not enough fuel and bad vp44. Where do I go from here. No check engine light, no smoke I am at a loss here. Beating myself over the head.
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post #2 of 5 (permalink) Old 08-21-2010, 04:06 AM
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Mine does that. VP got starved when the LP took a Not as bad with running some 2 cycle engine oil in the fuel, but still does it. Slowly getting worse..............

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post #3 of 5 (permalink) Old 08-21-2010, 10:29 PM Thread Starter
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So there really is no way to fix that other then rebuilding the vp then? I wondered if and aftermarket pump like a pureflow raptor would help.
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post #4 of 5 (permalink) Old 08-30-2010, 04:22 PM
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any after market lift pump will help. the manual states that the stock lift pump will pump between 5 an 10 psi to the vp44 when i put a guage on mine it was barly pumping 4 psi of fuel. it is important to remember that the vp44 is lubricated with diesel fuel. that is why running two cylinder oil in your fuels helps lubricate the vp44. the more fuel you can pump to the vp 44 the better, and what fuel you dont use will be returned to the tank by either the return in the vp44 or the return in the head which exits out the back of the head. you cant go wrong with the airdog, its easy to install and filters are cheap.

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post #5 of 5 (permalink) Old 08-31-2010, 02:02 AM
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You do realise that all these engines in a Freightliner class 5 and 6 do not have a lift pump in the tank. Just a thought!
Also the best fuel for lubricity was the 2% bio, and seeing as most every fuel supplier adds Bio to there fuel as a Cetain booster, and the fuel with 2 cycle oil was not as good as the 2%, did I miss the test that said that bio and 2 cycle is better?

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