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Gasping for fuel?

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Old 08-11-2017, 11:47 PM
Jaynes Jaynes is offline
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Gasping for fuel?

Long time lurker first time poster. I've got a 1969 f100 with a 360 in it. I've been working on it on and off for a while. Recently ran into a problem that I can't figure out. Little history first...truck has run/started on and off for about 10 years. I'm a teacher and the truck is still at my folks house so I only work on it in the summers on and off. Fixed little things one at a time. Recently had it starting and idling pretty well after replacing the distr cap, points, condenser and fuel filter. Decided to take it for a little cruise and it did something it's never done before. Cruising pretty good then would just cutoff like it was running out of fuel (of which the tank hand plenty). Is the new fuel filter bad? Something else? Thanks!
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Old 08-12-2017, 07:07 AM
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Bet it has a clogged fuel line, take the fuel line off the pump and see if gas is coming out. If not take the gas cap off and blow some compressed air from the fuel pump line into the tank. If clogged it will blow it back into the tank and gas will flow again. If this is the case you will need to pull and clean the tank or replace it if it cannot be cleaned.

If you have have fuel flowing when you take the line off then start looking at filter, etc.. But would bet it's a clogged line.

I just went though this with a 70-F100 that we just bought that had been sitting for 10 years, someone in the past tried to pour a liner into it without cleaning it proper and it made a mess inside the tank and had to be replaced.
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Old 08-12-2017, 07:47 AM
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Originally Posted by Jaynes View Post
Fixed little things one at a time. Recently had it starting and idling pretty well after replacing the distr cap, points, condenser and fuel filter. Decided to take it for a little cruise and it did something it's never done before.
Put the old condenser back in, the new manufactured condensers are pretty much all junk. Very common problem, see it all the time.
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Old 08-12-2017, 10:22 AM
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Originally Posted by Jaynes View Post
Long time lurker first time poster. I've got a 1969 f100 with a 360 in it. I've been working on it on and off for a while. Recently ran into a problem that I can't figure out. Little history first...truck has run/started on and off for about 10 years. I'm a teacher and the truck is still at my folks house so I only work on it in the summers on and off. Fixed little things one at a time.

Recently had it starting and idling pretty well after replacing the distr cap, points, condenser and fuel filter. Decided to take it for a little cruise and it did something it's never done before. Cruising pretty good then would just cutoff like it was running out of fuel (of which the tank hand plenty). Is the new fuel filter bad? Something else? Thanks!
Where is the fuel filter located that you replaced?

The original corrugated paper cartridge fuel filter is located inside a canister that threads onto the fuel pump.

People are unaware, so they install an in-line fuel filter. Meanwhile the cartridge fuel filter is getting more clogged up daily.
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Old 08-12-2017, 05:25 PM
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Quote:
Originally Posted by 3457-fl View Post
Bet it has a clogged fuel line, take the fuel line off the pump and see if gas is coming out. If not take the gas cap off and blow some compressed air from the fuel pump line into the tank. If clogged it will blow it back into the tank and gas will flow again. If this is the case you will need to pull and clean the tank or replace it if it cannot be cleaned.

If you have have fuel flowing when you take the line off then start looking at filter, etc.. But would bet it's a clogged line.

I just went though this with a 70-F100 that we just bought that had been sitting for 10 years, someone in the past tried to pour a liner into it without cleaning it proper and it made a mess inside the tank and had to be replaced.
You were on a run with pulling the cap then kind of went down hill and will tell you why.


Pulling the cap and testing will show if the cap is venting as it should.
Now the air blowing back into the tank from the pump can cause an issue.
There should be a screen filter aka sock. The air can blow it off or blow it up into pieces.


Now how old are the rubber fuel lines? Todays fuel kills them from the inside out so just replace them if old.

Quote:
Originally Posted by Tedster9 View Post
Put the old condenser back in, the new manufactured condensers are pretty much all junk. Very common problem, see it all the time.
I would give that a try also, bad condenser can cause all kinds of issues.
Dave ----
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Old 08-13-2017, 06:50 AM
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Originally Posted by FuzzFace2 View Post
You were on a run with pulling the cap then kind of went down hill and will tell you why.


Pulling the cap and testing will show if the cap is venting as it should.
Now the air blowing back into the tank from the pump can cause an issue.
There should be a screen filter aka sock. The air can blow it off or blow it up into pieces.
Not sure what you are talking about at the start of this? Mine was not a cap issue, it was a clogged line within the tank. I would bet on most 47+ year old trucks the sock is long gone from the feed line inside the tank. If you maintain the stock fuel filter i'm not sure its even required.
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Old 08-13-2017, 10:40 AM
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Quote:
Originally Posted by 3457-fl View Post
Not sure what you are talking about at the start of this? Mine was not a cap issue, it was a clogged line within the tank.

I would bet on most 47+ year old trucks the sock is long gone from the feed line inside the tank.
Sock slips onto the end of the fuel sending unit pickup tube.

There is no sock used with the 1961/77 in-cab fuel tank sending unit, as the pickup tube is part of the tank itself.

It's only used on Passenger Cars/Bronco/Econoline; 1967/72 F100/350 with sender used w/the optional auxiliary fuel tank & 1973/79 F100/350 with mid-ship & aft axle fuel tank senders.
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