Fuel Pressure Nightmare

Jrzfly wrote:
I bought a 1993 Ford E350/460 motor Shasta RV this year. The RV sat for a long period of time before I bought it. So first thing that I had done was have the fuel tank cleaned out and a new fuel pump and filter installed. A week after I got it back it was hard for the RV to get above 25 mph. It would bog out and back fire at the engine when you would push the gas pedal to try and excelerate. I had the cat converter looked at and it wasn't clogged. After further tests it was not getting enough fuel pressure. The mechanic drops the tank again and says the fuel pump was defective. Puts the new one in and RV drives good for half an hour and looses fuel pressure again. Take it back to the mechanic and he finds debri in fuel pump. He says the tank still has something in it. So I tell him to order a new tank, he proceeds with ordering with Ford per my VIN number and the Tank doesnt fit. So he can't find the right tank and tells me he has a better guy to clean the tank out. So back to square one. All this being said my RV has been off the road all spring and summer. Anyone have a similar problem or order a new tank before? VERY frustrated.

Update
So I got the tank cleaned out again and the mechanic said there was a lot of debri. The RV drove great for 2 hrs then the problem happened again. I was cruising at fifty when I came to a red light. As I excelled from a stop it would not get above 25 mph. I pulled over and **** the engine off for 5 minutes. As I started up and continued to take off the problem was gone. I was okay for another hour to my destination. My trip back I wasn't so lucky. The problem proceeded to get worse and worse. Every stop the problem would occur and if I was cruising on the highway and got to a hill I would dese and not be able to get going as I pushed the gas pedal down. So my solution was to put it in neutral. **** the motor off. Start it up and put it in drive and I would get ex celebration back with the gas pedal. I had to do it every 15 minutes on a 4 hour drive home. Very frustrated that 2 mechanics could figure this problem out.