Having low fuel pressure on a 1995, Cummins of course. Installed new overflow valve. Helped a little. Was suggested I check vacuum at the lift pump on back to fuel tank. Looking in the shop manual for these trucks, it mentions a special hose adapter tool, a tee. Gives part # as 6837.So far, haven't found this tee. This is on page 14-108. Anyone know where I could get this tee? Or any other way to check for a leak from the lift pump to the tank. Trying to avoid removing tank. Have not tried new lift pump. Want to keep it mechanical. Only 70K on the truck. Wouldn't think the pump would be out. Fuel heater is gone, screen there is clean. 10-15# at idle. Going down the road it drops to zero. Can only get to about 70-75 MPH . Could use some help!! jps

 

lift pump

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You put a lift pump in your tank, or someone else?

 

Must have misunderstood my post. No lift pump in the tank.. Just the old pump on the side of the block. Mechanical. jps