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HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 4784
Experience:  25 years Auto experience, Ford ,GM, Chrysler, Asian & European
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Same problem... not fuel in primary bowl. Engine runs about

Customer Question

same problem... not fuel in primary bowl. Engine runs about 10-20 seconds. Secondary bowl has level; both both levels checked with rolled napkin inserted into inspection port. Secondary comes out wet and smelling like fuel; primary nada... Fuel filters replaced upstream of sintered metal filter in carburetor. Problem developed over period of a few days, but it was getting harder to start and keep running longer than a fraction of a minute.
Submitted: 1 year ago.
Category: Ford
Expert:  HDGENE replied 1 year ago.

Hello, is the mechanical fuel pump pulling fuel up to the carb?

Customer: replied 1 year ago.
This 1985 vehicle has an electric fuel pump in the front and back gas tanks. The behavior of vehicle is same... 20 second runs with either tank. Purchase Rockwood RV in Phoenix in June 3014; drove to Texas w/o issues. Have short version of shop manual and noted that there is aoil pressure switch and the inertia switch in start circuitry. Tested inertia switch-worked fine (shook it and tested with test light); oil sketch was flaky when pressurized with compressed air-replaced with new one. That's when decided to check inspection ports on each bowl (primary & secondary) for presence of gasoline. This vehicle has the Holley manufactured for Ford 4180C two stage carburetor.
Expert:  HDGENE replied 1 year ago.

Ok so are you getting fuel flow to the carb if you jump either pump?

Customer: replied 1 year ago.
Just purchased a fuel pressure gauge. Plan to test pressure and flowrate into measured container from each tank tomorrow (i.e.: disconnect distributor center wire and fuel tubing connected to the carburetor).
Noticed that at the carburetor, the fuel line coming from the tank diversion valve, goes into a "tee"... One line goes to carburetor and the other returns to the fuel tanks. Assume this "tee" has a restricting orifice and not a spring loaded "relief" valve. If it is spring loaded it could allow most of gas to return to tank(s) and have insufficient pressure to feed carburetor. Might take it out also (tubing connections) and inspect it.
Expert:  HDGENE replied 1 year ago.

Either that or depending on the fuel system you may have a distribution bowl from the pumps its a black cannsiter on the frame rail from the fuel tanks, the bottom of it is a round bowl that spins off with a filter in it. the filter gets clogged and can be removed.

Customer: replied 1 year ago.
Have not noticed such canister, but will look again to confirm. There are large NAPA in line fuel filter on each tank's fuel line( replaced front tank one and sinteted metal filters when issue arose. Test results tomorrow.
Expert:  HDGENE replied 1 year ago.

Ok check fuel supply could be an issue with the fuel pump relay for the electric fuel pumps or restriction in the system

Customer: replied 1 year ago.
There is a fuel cutoff relay between the inertia switch and the tank selector relay, that is energized by the oil pressure switch closing when oil pressure increases. Had no idea what it looks like, not where it is located but it is a common mode failure component... It impact engine operation regardless from which tank carburetor is fed from.
Expert:  HDGENE replied 1 year ago.

Gimmie lil time to research it, being an older vehicle some of the information is hard to find. If not in the main fuse panel under the hood, it may be near the eec power and fuel pump relay on the fender well

Expert:  HDGENE replied 1 year ago.

Says its in the engine bay onthe left side firewall area. Let me see if i can find a picture of the location

Customer: replied 1 year ago.
Great. A picture of fuel cut-off relay will be very useful.
Expert:  HDGENE replied 1 year ago.

Most of the online stuff isnt great. Let me get to work in the morning and see if I can dig up an old wiring diagram book at the dealer, but sound slike its near the eec power and fuel pump relay on the drivers side under the hood.

Customer: replied 1 year ago.
That will be fine. Will inspect under the hood on drivers side then.
Expert:  HDGENE replied 1 year ago.

Very good, ill get back to you as soon as possible im on arizona time here

Expert:  HDGENE replied 1 year ago.

Im not having any luck here with an old wiring manual at the dealer. i go back that far, but most of the books are gone. No truck manuals and the online versions are poor.Your local ford dealer may have a manual to help identify the circuit and componet all ford online manuals drop off after1990

Customer: replied 1 year ago.
The vehicle has two batteries. The passenger side battery appears to feed starter via a large solenoid mounted inside fender. Battery on driver side has also a smaller solenoid or relay. Will check voltages with ignition switch turned on, while crancking engine and during short run. Need to get a long wire with alligator clips to hook-up remotely voltmeter on solenoid outputs.
Expert:  HDGENE replied 1 year ago.

Ok very good, All I can give you is the location of the cut off relay like I did.

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