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GenSet Fuel Line - 83 Ford E350 jd 1-25-03  
Coach is 24ft 1984 Holiday Rambler Ambassador Class C. Chassis officially 1983. Coach was "prepped" for genset with battery cables, remote control harness and 120VAC junction box in the generator bay, but the optional genset wasn't ordered. I have one to install (ONAN 4.0 "BFA" with onboard electric fuel pump), but "prep" did not include a FUEL LINE.
Chassis has carbureted 460 with electric selector for two tanks, each with low pressure electric pump. Pressure and return line to selector from each tank, then single pressure and return lines to the engine and back. There's a short line from the rear tank to the driver side frame, but it turned out to be a vent. Can't suck fuel even from a full tank.
I've been told I can tee the genset fuel feed into the Return line for the rear tank (tee between selector and tank), but others say it won't work because the return doesn't extend far enough into the tank.
Benefit of a return line (if it's down into the fuel level) is it's not pressurized, doesn't require selector to be energized, doesn't require genset fuel pump to try and draw fuel through chassis fuel pump when not running.
Anybody got experience with this? I don't want to drop the tank if I don't have to, but don't want to waste time on something that won't work. Do you know if there's a genset fitting on either of the tanks on these models/years? I'm not concerned about the idea of being sure the pickup goes only partway into the tank to prevent the risk of running coach out of gas with the genset.
Long post, but it's been a long trail to this point. Thanks and God Bless, jd
Re: GenSet Fuel Line - 83 Ford E350 Sam Watson 1-26-03  
Return line isn't submerged in fuel, so it is no good as a supply line. All you need to do is select either fuel supply line to selector valve assy. and tee into it. Ford's low pressure pumps are patterned after Telsa's turbine motor, that is, merely a stack of discs with holes drilled through the stack, stack is then given a slight twist so that the holes now form a multitude of spiral pathways, spin it with an electric motor and it makes a good pump,(no valves, springs, etc). The genset's pump, if not mounted too high, should pull sufficient fuel to operate. To prime the genset, just start chassis engine and switch to that tank.
Re: GenSet Fuel Line - 83 Ford E350 jd 1-26-03  
Sam,

This has bugged me for months and I'm sure thankful you could settle it!

Let me be sure I understand. Since the in-tank pump has no check valves the genset's pump will draw fuel through it even when not running. Correct? I'm wondering if I'll need a positive fuel shutoff at the genset. Had planned to use a Purolator low pressure electric pump to feed the genset. Those do not become a shutoff when not running, so the in-tank pump would be putting pressure on the genset needle and seat in normal driving with the genset off. What do you think about that?

I just yesterday figured out the electrical transfer, so getting the fuel supply settled really helps round out the picture.

From Tampa FL on the day our team won the Super Bowl! GO BUCS!

God Bless, jd
Re: GenSet Fuel Line - 83 Ford E350 Sam Watson 1-27-03  
That's right JD, the in-tank pump contains no check valves to impede the gen set's fuel intake. Good idea re: the in-line shut off valve to the gen set. How about putting a 12 volt solenoid valve in the gen set's fuel line, wired into the set's ignition? Such valves are available at shops that do butane conversions for vehicles.
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