No pump in the tank... fuel is pulled from the tank by the lift pump
(electrically driven) on the rear driver's side of the engine, then fed to
the high-pressure injection pump (gear-driven by the engine - looks like a
miniature inline-6 engine with 6 fuel lines coming out of it), which feeds
And Cummins has two m's :)
that is what I feared, someone placed a gas rig pump in the tank, I don't
know why, but it is the same pump that is in my Dakota, with the same flaws.
the screws had popped out of the slides, and it has a undersize filter on
bottom, with a 12 volt pump in the center. I fixed the screws, and locked it
in positioned so it will just touch bottom of empty tank, and I put a press
nut on the new sending unit to keep the pivot point from getting slack. I
don't think this was original equipment. but the truck runs good so I
decided to leave it alone.
Wow. Well, if it makes you feel any better, the '05 and up Rams with
Cummins went back to an in-tank pump, and any '94 and up trucks that go into
the shop for lift pump replacement get retro-fitted with the in-tank pump.
It's not that it's a bad idea, but if it's really a gasoline fuel pump in
the tank, it's going to put out about 45psi of pressure, which the diesel
lift pump was never designed to take.
Easiest way would be to hook a fuel pressure gauge to the fuel supply line
to the lift pump. I doubt this was done as an "authorized" repair, because
1) the in-tank pump has only been in use for less than a year, and 2) they
would have removed the engine-mounted lift pump at the time of conversion.
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