dumb fuel tank question
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7th Gear
Joined: Oct 2011
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dumb fuel tank question
My 68 F100, is not getting fuel. It has been sitting for several months. I checked the fuel lines and all are clear. (I added extra gas just to be sure that wasn't the problem) Opened the fuel filter, no fuel there?? So now I don't understand how the gas gets from the tank to the fuel pump. The metal fuel line runs to the top of the tank. I don't get how the gas flows up to the fuel line on the top of the tank. What stupid thing am I missing. I know this is going to give some of you guys a good laugh. I sort of thought of myself as fairly competent but now I don't know 
thanks
peter
thanks
peter
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Welcome to FTE
What fuel filter did you "open?" As original, the cartridge fuel filter is located inside a metal cannister that threads onto the fuel pump.
Peeps are unaware, so it rarely gets changed, and...since they are unaware, they install an inline filter.
What fuel filter did you "open?" As original, the cartridge fuel filter is located inside a metal cannister that threads onto the fuel pump.
Peeps are unaware, so it rarely gets changed, and...since they are unaware, they install an inline filter.
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7th Gear
Joined: Oct 2011
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I checked the filter on top of the fuel pump. Unscrewed the canister - dry as a bone. I'm thinking that the fuel is sucked up a fuel line that is inside the tank by the fuel pump. So either the fuel pump is bad, there is a hole in the line letting air in so the suction doesn't work, for the fuel line in the tank is bad...??
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Welcome to FTE
The bottom of the fuel tank prolly has a lot of rust and scale. Remove the fuel sending unit, look down inside the tank.
Radiator shops can 'boil out' fuel tanks, liners are available if the tank is rusted out, and...
Blue Oval Truck Parts reproduces the tank (D0TZ-9002-A). It's actually the 1970/72 19 1/2 gallon tank, but in 1970, Ford replaced the original 1961/69 18 gallon in-cab tank (C1TZ-9002-K) with this one for use as a Service Part Replacement.
The same fuel sending unit, filler tube and grommet are used.
Blue Oval (in Anaheim CA) reproduces it, but all the repro parts sellers have it. The closest source to TX would prolly be Classic Auto Parts (formerly Ford Parts Obsolete) in OKC
The bottom of the fuel tank prolly has a lot of rust and scale. Remove the fuel sending unit, look down inside the tank.
Radiator shops can 'boil out' fuel tanks, liners are available if the tank is rusted out, and...
Blue Oval Truck Parts reproduces the tank (D0TZ-9002-A). It's actually the 1970/72 19 1/2 gallon tank, but in 1970, Ford replaced the original 1961/69 18 gallon in-cab tank (C1TZ-9002-K) with this one for use as a Service Part Replacement.
The same fuel sending unit, filler tube and grommet are used.
Blue Oval (in Anaheim CA) reproduces it, but all the repro parts sellers have it. The closest source to TX would prolly be Classic Auto Parts (formerly Ford Parts Obsolete) in OKC
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7th Gear
Joined: Oct 2011
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Thanks much for your suggestion. Just so I know how this works, is the fuel sucked up the fuel line in the gas tank by the fuel pump mounted to the left side of the engine? To verify that the pump is working, I should be able to disconnect supply line and feel a suction at the pump with the engine cranking, right?
Thanks!
Thanks!
Posting Guru
Joined: Jun 1999
Posts: 1,083
Likes: 1
Like ND said, if the pump has suction the prob is between the tank and the pump...very common for crap in the tank to block the pick-up at the end of the fuel line in the tank. Pull the sending unit off the top of the tank and shine a light down the filler neck into the tank to see what's up in there.
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