It is in the fuel tank.It is in the fuel tank.
Replace the part that is leaking
My truck is also a 1999 3500 and the press. is about 13 - 14 psi before the filter on a stock lift pump,after the filter you lose about a pound depending on how dirty it is.
Lift pump failing and then taking out the injector pump
The fuel lift pump is located on the left-rear side of the engine cylinder block above the starter motor
It will have a lift pump (may be on engine or in the tank) and an injection pump.
Both the lift pump and injection pump are on the left side of the engine.
The lift pump must have failed, or the pick up tube in the tank has broken.
The lift/transfer pump is in the fuel tank. The injection pump is on the left side of the timing cover.
Lift pump pressure is in the 10-15 psi range. Injection pressure is upwards of 15,000.
Initially the lift pump was on the fuel filter housing. Most were later retrofitted to put it in the fuel tank. The injection pump is on the front left of the engine.
Gas engine, the fuel pump is in the fuel tank. Diesel engine, the lift and injection pumps are on the engine block.