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  #1  
Old 03-15-2016, 03:21 PM
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anoldbiker anoldbiker is offline
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Default Was this guy blowing smoke ?

This is the first time Iíve heard this and canít find any real info to verify it.

I was with the understanding that the lift pump pulled fuel from the tank, pressured it through the system including the filter(s) and to the injector pump, which pressures it up and flows to the injectors, any excess would flow back to the fuel tank while removing heat from the injector pump at the same time. This is a constant s long as the truck is running.

Now here is what I question:
I was recently told that if the lift pump in the tank should fail / not pump fuel, the injection pump will suck the fuel from the tank and to the injectors running the truck with excess flowing to the tank. This will maintain the truck running as long as your not lead footing it or pulling a heavy load Ö thus over demanding the truck.

Since I can not verify this as correct or not, I decided to through this out for a response or comments.

Was this guy blowing smoke Ö or is this correct ?

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Old 03-15-2016, 06:39 PM
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Default

It's true depending on the engine. Most db2 engines will pull fuel, also bosch pumps.

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Old 03-15-2016, 07:27 PM
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Yep, they will keep running. The Duramax hs not had a lift since they went with a CP3. I am not sure why the Cummins with a CP3 needs a lift pump, but they are like the VP44 pumps. They will keep running until either the injection pump fails or air gets introduced into the system.
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Old 03-15-2016, 11:24 PM
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Thanks, I didn't know if this was blowing smoke or the truth.
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2006 Dodge Ram, 2500, Big Horn, 5.9 Cummins, 4x4, Q/Cab, 48RE, L/B, 3.73, S&B CAI & Snout, ProFlo 5" S/S exhaust, Smarty Touch, Oil ByPass Filter Kit, Transfer Flow 56 gal tank, 110 gallon in-bed tank, XX-Fuel System, Coolant Bypass Kit, Mag-Hytec front & rear, 285 x 70 x 17

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