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.

from your notes,, the first guy did not clean the tank correctly, bills on him. you have to remove tank and pump clean,, clean ..and clean. there places that can do do it, your guy is not the lace, hope it works out for you, .. have that new pump cleaned as well.and change any in line filters.

After you get it back together, Change fuel filter 3,000 miles for first 9,000 miles. Crud might be working loose as rv is getting used again. Some crud is almost impossible to get out of tank. But will break up as you use rv. Carry spare filter and everything you need to change in middle of nowhere.Don't know where you are but if close to commercial fishing boats see if you can find out who cleans those fuel tanks. Marine environment really is hard on those tanks and those type mechanics know how to really clean those tanks out.If RV sat for a long time before you bought, I would change all fluids.

Just found a fine silt in our front tank then found cracks in the fill and vent hose. Cleaned cleaned and cleaned and replaced hoses fingers crossed?

OP and T&G - follow path1's advice. Filters aren't but a few dollars, OK maybe $10 or so, change till they flow free. If you drain the filter and let it dry, you'll find out real fast how free or clogged it is. Just blow through a new one and one you've removed.First one I replaced, old one turned me red in the face but I could blow a little air through it. Went to the auto supply and tried a new one. No effort to blow dust around on the floor.

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.UpdateSo 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.

Fuel Pressure Nightmare | Good Sam Community

midnightsadie
Explorer II
Aug 15, 2014
from your notes,, the first guy did not clean the tank correctly, bills on him. you have to remove tank and pump clean,, clean ..and clean. there places that can do do it, your guy is not the lace, hope it works out for you, .. have that new pump cleaned as well.and change any in line filters.
path1
Explorer
Aug 15, 2014
After you get it back together, Change fuel filter 3,000 miles for first 9,000 miles. Crud might be working loose as rv is getting used again. Some crud is almost impossible to get out of tank. But will break up as you use rv. Carry spare filter and everything you need to change in middle of nowhere.

Don't know where you are but if close to commercial fishing boats see if you can find out who cleans those fuel tanks. Marine environment really is hard on those tanks and those type mechanics know how to really clean those tanks out.

If RV sat for a long time before you bought, I would change all fluids.
TyroneandGladys
Explorer
Aug 16, 2014
Just found a fine silt in our front tank then found cracks in the fill and vent hose. Cleaned cleaned and cleaned and replaced hoses fingers crossed?
j-d
Explorer II
Aug 16, 2014
OP and T&G - follow path1's advice. Filters aren't but a few dollars, OK maybe $10 or so, change till they flow free. If you drain the filter and let it dry, you'll find out real fast how free or clogged it is. Just blow through a new one and one you've removed.
First one I replaced, old one turned me red in the face but I could blow a little air through it. Went to the auto supply and tried a new one. No effort to blow dust around on the floor.
Jrzfly
Explorer
Sep 27, 2014
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.
carringb
Explorer
Sep 27, 2014
The fuel tank lining has probably delaminated. Really is need a full strip-down and re-lining, or switch to a plastic tank. Should not be hard to find one.
Jrzfly
Explorer
Sep 28, 2014
If the tank was clogging the fuel pump or filter wouldn't it not get any fuel pressure and not even start. Could this be a fuel injection problem? What tells what the motor needs more fuel to excelerate?
carringb
Explorer
Sep 28, 2014
On your rig, fuel delivery is determined by Manifold Absolute Pressure. Your symptoms however sound exactly like fuel starvation. An obstructed fuel pump or filter will still slow enough to start, but not enough to deliver power at cruising speeds. Your problem could go away after a restart simply because shutting everything off lets the flakes fall away from the strainer.

Delamination is not a rare problem unfortunately, and bio-fuels (i.e. ethanol) seem to contributor, as some components were never designed for it. It could also just be plain old rust, if water had ever gotten in there previously. Either way.... fuel pumps and fuel filters don't normally plug up like that repeatedly, unless there is a problem with the tank.
Harvey51
Explorer
Oct 03, 2014
There ought to be a way to run the fuel pump with the line disconnected at the filter and watch what flows out, perhaps onto a large cloth filter over a pail. Run a few gallons through and maybe it will get rid of all the crud. At least you would know if the problem is still there. Could even do it with the tank off and not put it back unless the crud flow ends.
Jrzfly
Explorer
Oct 13, 2014
Nother update: Mechanic dropped tank and did some fuel pressure testing. Tanks clean, pump and filter clear. Still losing pressure or not receiving enough to accelerate. He is moving on to check possible electrical problems, didn't like how the relay looked. Any suggestions out there?

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