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Dodge puts junk lift pumps on the trucks. For the newer gens, it is not a problem if you are not modded but when you do mod the truck, it adds more fuel...because in a diesel you can keep throwing fuel at it (and to a certain poit) will keep making power. Well, if it adds more fuel, it's goign to need more fuel. When enough fuel is added, the stock pump won't keep up...
Acceptable pressure for the 24v is 15ish psi, never lower than 5. For the 12v, you can run considerably more, but am not sure how much...
To add, the problem with low fuel pressure is, not only will it hurt performance (starving the engine) but the injection pumps are lubricated with diesel...and when there isn't enough pressure they are starved and thus running without lubrication...which causes destruction!
How are you going to know if the fuel pump needs to be upgraded if you don't have a gauge...If you have a 12v though, I don't think a fuel pressure gauge is important...unless you're going for big HP...
For the VP-44 trucks (98.5-02), if the lift pump dies, the injection pump dies and an injection pump will cost $1200 (pump alone) plus the person will still have to upgrade the lift pump. If you have a fuel pressure gauge, you'd know if the lift pump is bad and could replace it before it takes the VP out.
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