fuel supply problem
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fuel supply problem
Folks, hope you can help me. Have a '67 F100 with I believe a 300 in it. Have been having a serious problem with it cutting out as I try to accelerate going uphill. Rebuilt the carb which was on it, but the rebuild kit did not have correct size needle valves. So purchased a new (rebuilt) and installed it, still same problem. Replaced the fuel pump (twice in case by chance the first one was bad) still same problem. I have a small secondary in line filter between the fuel pump/primary filter unit and the carb. When it last cut out on me I jumped out quickly and saw no fuel in the in-line filter.Fuel tank pulled last year to repair leak. Any ideas on where to go from here, 'cause I'm floundering now!
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From: Westminster, Colorado
Does this vary with the amount of gas in the tank?
Even if it does not....you might want to check the pick up tube in the tank....mine had developed several little holes in it which allowed air to enter the line, thus killing fuel flow....
Even if it does not....you might want to check the pick up tube in the tank....mine had developed several little holes in it which allowed air to enter the line, thus killing fuel flow....
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Does not vary with amount of gas in tank. Will look at pick up tube when I get home. Keep 'em coming. BTW reading the forums, quite likely I do have in fact the 240 not 300, but don't reckon that changes the problem huh?
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From: Simi Valley, CA
240/300 makes no difference
Since there's no vent on the in-cab fuel tank, these trucks use a vented fuel cap, instead.
The same vented fuel cap was used on trucks from 1948 thru 1972 (except some 1970/72's that have Evaporative Emission).
Take the fuel cap off, look on the backside of it for the round vent hole. It's located in the center of the cap.
If there's no vent hole in this location, your truck has a non vented fuel cap.
A non vented fuel cap will cause a fuel delivery problem, and could cause the tank to collapse.
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Yes sir, had the same feeling about the engine size. Will check fuel cap on return home, however this is a recent (comparatively) problem, had been driving the truck on a daily basis for @ 1yr before this problem arose, including 250 mile roadtrips towing boat or work trailer. Is it possible for the vent hole to have clogged up?
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Checked the gas cap, it has the hole, so is a vented cap, but once again can that vent system become clogged, perhaps a new cap would be in order. Am unsure where to find the pickup tube, or how to pull it outto check it.
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From: Simi Valley, CA
The pickup tube comes out from the top of the tank, just to the left (drivers) side of the sending unit, runs across the top of the tank, then down its left side, then out thru a hole in the floor pan.
A short neoprene rubber hose connects the pickup tube to the fuel line (using clamps), which then runs along the left outer frame rail, then it runs over to the fuel pump.
Is the In-Cab fuel tank the only tank on your truck, or is there another?
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Bill,
Had misunderstood, I would have referred to this (probably incorrectly) as the fuel line, I had thought that maybe there was a pick up tube inside the tank. I will inspect this for any holes when I get home, have not noticed any fuel leaks when parked. The in-cab tank is the only one on the truck. Have replaced the rubber lines. Thanks again for your interest. Standing by.
Had misunderstood, I would have referred to this (probably incorrectly) as the fuel line, I had thought that maybe there was a pick up tube inside the tank. I will inspect this for any holes when I get home, have not noticed any fuel leaks when parked. The in-cab tank is the only one on the truck. Have replaced the rubber lines. Thanks again for your interest. Standing by.
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Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Bill,
Had misunderstood, I would have referred to this (probably incorrectly) as the fuel line, I had thought that maybe there was a pick up tube inside the tank. I will inspect this for any holes when I get home, have not noticed any fuel leaks when parked. The in-cab tank is the only one on the truck. Have replaced the rubber lines. Thanks again for your interest. Standing by.
Had misunderstood, I would have referred to this (probably incorrectly) as the fuel line, I had thought that maybe there was a pick up tube inside the tank. I will inspect this for any holes when I get home, have not noticed any fuel leaks when parked. The in-cab tank is the only one on the truck. Have replaced the rubber lines. Thanks again for your interest. Standing by.
The In-Cab tank has a separate pickup tube. The auxillary tanks have the pickup tube as part of the fuel sending unit.
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Bill, my pick up tube has a flare nut fitting at the top of the tank where the line from the fuel pump to the tank terminates at the top of the tank. I am unable to inspect the section of the pick up tube inside the tank as I do not know how to remove it (do I just pry it out, which I think would damage the integrity of the tank) or even if I can remove it.
70efftwofifty, I had this problem before I rebuilt the old carb and I set the float to specs at that time in case it was the original problem, the problem remained. I have not reset the float on the new carb I have installed, I suppose I could, but truck is running beautifully except when fuel is demanded going up hills, check my note on the secondary in-line fuel filter being empty when truck cuts out, leading me to search for a different reason for the problem.
Thanks to both of you for your on-going assistance. Standing by.
70efftwofifty, I had this problem before I rebuilt the old carb and I set the float to specs at that time in case it was the original problem, the problem remained. I have not reset the float on the new carb I have installed, I suppose I could, but truck is running beautifully except when fuel is demanded going up hills, check my note on the secondary in-line fuel filter being empty when truck cuts out, leading me to search for a different reason for the problem.
Thanks to both of you for your on-going assistance. Standing by.
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From: Simi Valley, CA
Bill, my pick up tube has a flare nut fitting at the top of the tank where the line from the fuel pump to the tank terminates at the top of the tank.
I am unable to inspect the section of the pick up tube inside the tank as I do not know how to remove it (do I just pry it out, which I think would damage the integrity of the tank) or even if I can remove it.
I am unable to inspect the section of the pick up tube inside the tank as I do not know how to remove it (do I just pry it out, which I think would damage the integrity of the tank) or even if I can remove it.
The inside of the tank has rust and scale in it...this jazz is floating around inside your tank and plugging up your fuel lines.
The problem gets worse when the tank is less than half full.
The only problem is...once the tank is out, it may have pin holes in it caused by rust. Radiator shops can install a rubber bladder or a coating to solve this problem.
A reproduced in-cab fuel tank (DOTZ9002A) is available from FTE sponsor Blue Oval Truck Parts, the other aftermarket parts sellers also sell this tank.
This tank is 19 gallons, was used in 1970/72's, but...will also fit all 1961/69's. In fact...
In 1970, Ford obsoleted all the 1961/69 tanks, replaced it with this one for use as a Service Part Replacement
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