1994-1998 Dodge 5.9L Cummins Fuel Sumps

Fuel tank sumps on the 1994-1998 Dodge Ram 5.9L Cummins

The stock fuel system on a 12-valve Cummins starts inside the tank. The pickup rides on the sending unit with a barrel strainer, and the cam-driven mechanical lift pump on the block pulls fuel through it, through the fuel heater and pre-strainer and the spin-on filter, and on to the P7100 injection pump. Excess fuel goes back to the tank through the return hose. That layout is fine for a stock pump. It changes when you move to a frame-mounted electric lift pump and filtration system. Those systems draw from the tank through either a draw-straw or an added tank sump, and this page covers the sump side.

What fails and why

A sump does not fix a failure by itself, but the tank it goes into has known problems. The fuel sending unit on 1989-2002 trucks sticks or reads low all the time, and the barrel strainer it carries can bind. The fix is dropping the tank and replacing the sender and strainer, so if the tank is coming down for a sump, do both while it is out. The rest of the low-pressure side has its own weak points, mainly the rubber return hose under the intake manifold and the short hoses at the lift pump, which harden and let air in.

Stock replacement vs. upgrade

If you are keeping the factory mechanical pump, you do not need a sump. A sump is part of the upgrade path. A frame-mounted system replaces the mechanical pump, adds water separation and fine filtration, and holds 35 to 55 psi of supply for modified engines; FASS systems, for example, put a water separator and a particulate filter on the frame rail ahead of the engine. The sump and the pump work as a pair, so pick the pump first and let its supply and return routing decide which sump you need.

What we carry

We carry XDP fuel tank sumps: the XD182 one-hole design, and the XD243, the same one-hole design with a fuel return added. From G&R Diesel there is the GRD00153 bottom sump with an integrated return. If you have not picked a pump yet, start on our lift pumps page and match the sump to it.

Fitment notes

Sumps mount to the tank, so the real fitment question is your fuel system plan. Decide whether your lift pump kit wants a separate return or a return through the sump before choosing between the XD182 and the return-style sumps. Keep the 1998 split in mind for the pump that feeds it: Dodge changed to the 24-valve partway through that model year, and lift pump parts listed for 1998.5-2002 VP44 trucks do not fit a 12-valve. Confirm your engine, or call us with your VIN.

Frequently asked questions

Do I need a sump if I am keeping the factory lift pump?

No. The factory cam-driven pump draws through the pickup and barrel strainer on the sending unit. A sump is for a frame-mounted electric lift pump and filtration system, which draws from the tank through a sump or a draw-straw.

What is the difference between the one-hole sump and the return-style sumps?

The XDP XD182 is a one-hole design. The XDP XD243 adds a fuel return, and the G&R Diesel GRD00153 has an integrated return, so return fuel goes back into the tank through the sump. Match the choice to how your lift pump kit routes its return line.

My fuel gauge is stuck. Should I fix that while the tank is down?

Yes. The sending unit on these trucks commonly sticks or reads low, and the barrel strainer on it can bind. Both are fixed by dropping the tank, so replace the sender and strainer while it is out for the sump.

Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.