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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.Because its a GM manufactured chassis in order to determine what the part number on the fuel pump is you are going to need to contact your local GM dealer along with your vin number and tank size and they should be able to tell you which pump your have, one other way would be to retrieve the part number off of the old pump and they should be able to cross it over for you. The common problem is usually due to a fuel pump failure and not the relay. Due to the age of the coach, Winnebago dose not have a parts listing.
I would agree and the place to start is to check key on, engine cranking at the connector at the fuel pump. Unfortunately Winnebago on a coach this old does not offer relay locations but in mot cases you will find them in the relay center in the engine compartment, that being said, the fuel gauge is not connected to the FP relay at all.
Unfortunately I do not, I have done them before you its not to bad as long as the tank is not full of fuel, to replace the fuel pump you will need to place a floor jack under the center of the tank and then remove the mounting strap bolts that hold the tank to the frame, once you have the straps loose lover the tank down which will give you access to the fuel pump assembly, most are bolted to the tank with 6 to 8 bolts, remove them and the pump assembly pulls up and out.