hello i need help with a fuel pump issue on a 1994 coachmen santara with 460 on e350 chassis. I never had any issues with this rig untill i parked it after camping and went to start it a few months later and will not fire. I can get it running with carb spray so i narrowed it to a fuel delivery issue. i disconnected fuel line before fuel filter and no fuel when cranking. I checked that inertia switch and no problem found there, cant find the fuel pump relay because i dont have a manual. i do not here the pump running when i crank it over so now i have checked power and ground at the connector to the fuel pump. i dont have a wiring diagram so maybe someone could help me here. The connector is a four pin connector, i have a test light and its showing a good ground from a black wire and a orange wire on the pump side connector. I also have power comming from a yellow wire but my test light illuminates weak. I have another power wire which looks pink or red and illuminates brightly when key is in the on position then the light turns off and back on when cranking engine over. Now to me this sounds like a bad pump and looking for someones opinion or maybe has a picture of the fuel system wiring. thank you

 

Yes it sounds like a bad pump or the orange (GY/R) and black wires are not going to ground like they should.
The yellow wire (Y/W) is for the fuel gauge only and the "pink or red" (PK/BK) wire is the fuel pump power supply.



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Turned out to be a failed fuel pump, purrs like a kitten now! Man what a pain in the a$$ to drop that fuel tank in the driveway laying on my back, next time if there is a next time I'm cutting a hole in the floor...

 

I'd advise against this even though it seems the easier way. You'll be inviting rust to invade your floor, eating it away. With the tank still in place there's no real good way to treat the raw exposed edges of the floor. If there's another advantage to dropping the tank you're by default also checking the filler hose which have been know to crack and leak, also not good.

Glad your van is back up and running now!

 

My 96 E350 7.5l Jamboree is having the same issue. Voltage test was exactly the same as yours. I just bought a new pump and will try to put it in tomorrow. You are correct, looking at the tank, it would appear to be a big pain to drop it. Any thoughts on simplifying the process would be appreciated.

 

Some cut a hole in the floor if applicable and then patch the hole.