No fuel getting to ford RV.

hscrugby

Well-Known Member
Joined
Mar 22, 2005
Location
Raleigh, NC
I've got an older motor home, based on an econoline 350 chasis.
It died the other day, from a complete lack of fuel it seemed. Had to tow it home, etc.

So I'm trying to figure out where and how the fuel pumps etc work on this thing. It's doing "something" with fuel, cause the generator starts and will run fine. Just nothing to the engine. What I'm trying to figure out is if there are maybe 2 low pressure pumps in the two tanks, and a high pressure pump along the rail? or low pressure in the switch assembly (that switches between tanks) and high pressure right beside it?
Here are pictures of what I see under there:
ai783.photobucket.com_albums_yy113_hscrugby_Misc_20Items_2012_07_14125320_1.jpg

close up of the "switch assembly"
ai783.photobucket.com_albums_yy113_hscrugby_Misc_20Items_2012_07_14125352.jpg

Close up of maybe fuel pump?
ai783.photobucket.com_albums_yy113_hscrugby_Misc_20Items_2012_07_14125400.jpg


The red wire going into the "fuel pump" is not hot. Ever. The ground is good though. Any ideas? Could the fuel pump just be bad, and it blew a fuse somewhere inline along that red wire? (I tried tracing it, but couldn't figure it out exactly.) Looking at parts, I honestly am not sure what the heck that thing is. It does NOT look like the replacement fuel pump, but being an RV, there is no telling what gets swapped out. The tank selector valve looks almost identical to the picture at autozone.
 
What model year? EFI, I assume? Are you getting fuel pressure at the rails? Are both pumps getting power? Does it work off one tank, but not the other? As far as I can recall, they won't run without a low pressure pump.

Assuming that's the dual pump setup that the early EFI trucks got, it's got a low pressure lift pump in each tank, the selector valve, and the high pressure (~90psi) pump on the frame rail. Regulator is on the fuel rail, and it'll have a return back to the tank. On the selector valve, half of those lines are feed, half are return.

The generator will have its own pickup and fuel pump. I'd only use that as an indication that there is fuel in one of the tanks.

My money is that whatever that high pressure pump is, it crapped out. But you're going to have to do a little troubleshooting first. And put some decent hose clamps on that pump before a line comes loose and burns the camper to the ground.
 
shawn said:
What model year? EFI, I assume? Are you getting fuel pressure at the rails? Are both pumps getting power? Does it work off one tank, but not the other? As far as I can recall, they won't run without a low pressure pump.

Assuming that's the dual pump setup that the early EFI trucks got, it's got a low pressure lift pump in each tank, the selector valve, and the high pressure (~90psi) pump on the frame rail. Regulator is on the fuel rail, and it'll have a return back to the tank. On the selector valve, half of those lines are feed, half are return.

The generator will have its own pickup and fuel pump. I'd only use that as an indication that there is fuel in one of the tanks.

My money is that whatever that high pressure pump is, it crapped out. But you're going to have to do a little troubleshooting first. And put some decent hose clamps on that pump before a line comes loose and burns the camper to the ground.
Click to expand...
Yea, no pressure at all after that pump.
It's an 84, so no EFI.
i tried searching on the model number for that fuel pump to find specs, so I could replace it, but I can't find anything.
And I can't find that exact pump for sale anywhere.
I'm thinking the pump died, and blew a fuse or something to keep it from getting power.
 
Oh, if it's just a carb, it should be easy to fix. You've got that lift pump, the diverter valve, and that's probably it. Any electric fuel pump should get you back in business.
 
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