Gas stops pumping
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Tuned
Joined: Dec 2017
Posts: 387
Likes: 22
Gas stops pumping
Been having problems with my 66 f100 where I'll be driving around just fine. Stop to talk to a friend or whatever, start back up fine, the I can hear my electric fuel pump making the knocking sound that it's running out of gas. I believe I've been through fuel line and can't find pin holes. Anyone got any ideas? Thanks
Lead Gopher
Joined: Aug 2012
Posts: 10,040
Likes: 1,590
From: Seattle
It reminds me a little bit of what can happen with a stock gas tank and an unvented gas cap. Probably a long shot but it might be worth a quick double-check to make sure your cap is vented both ways (in and out). The stock tank has no separate vent so the only way for air to replace the fuel as it is used up (or the opposite - if the fuel expands on a nice warm day the air must escape) is thru the gas cap.
A person can actually remove a gas cap and test the venting of the cap itself. Many have a check ball in the cap so if you, for example, go around a right hand corner fairly quickly the check ball rides up the gas cap blocking the vent so gas doesn't slosh out. Once the centrifugal force stops then the check ball slides back away from the vent.
It's probably something else, but worth a shot.
Chad
A person can actually remove a gas cap and test the venting of the cap itself. Many have a check ball in the cap so if you, for example, go around a right hand corner fairly quickly the check ball rides up the gas cap blocking the vent so gas doesn't slosh out. Once the centrifugal force stops then the check ball slides back away from the vent.
It's probably something else, but worth a shot.
Chad
FTE Legend
Joined: Nov 2015
Posts: 30,876
Likes: 4,116
From: Angier, NC
Where is this electric pump mounted?
Electric pumps do not pull fuel and should be mounted wet below the fuel level.
By wet I mean the pumps inlet should have fuel at it all the time.
Dave - - - -
Electric pumps do not pull fuel and should be mounted wet below the fuel level.
By wet I mean the pumps inlet should have fuel at it all the time.
Dave - - - -
Thread Starter
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Tuned
Joined: Dec 2017
Posts: 387
Likes: 22
It reminds me a little bit of what can happen with a stock gas tank and an unvented gas cap. Probably a long shot but it might be worth a quick double-check to make sure your cap is vented both ways (in and out). The stock tank has no separate vent so the only way for air to replace the fuel as it is used up (or the opposite - if the fuel expands on a nice warm day the air must escape) is thru the gas cap.
A person can actually remove a gas cap and test the venting of the cap itself. Many have a check ball in the cap so if you, for example, go around a right hand corner fairly quickly the check ball rides up the gas cap blocking the vent so gas doesn't slosh out. Once the centrifugal force stops then the check ball slides back away from the vent.
It's probably something else, but worth a shot.
Chad
A person can actually remove a gas cap and test the venting of the cap itself. Many have a check ball in the cap so if you, for example, go around a right hand corner fairly quickly the check ball rides up the gas cap blocking the vent so gas doesn't slosh out. Once the centrifugal force stops then the check ball slides back away from the vent.
It's probably something else, but worth a shot.
Chad
Thread Starter
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Tuned
Joined: Dec 2017
Posts: 387
Likes: 22
it's mounted in frame rail right after fuel line makes the bend into the rail.
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Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
The filter sock in the tank might be plugged. You can blow compressed air into the tank through the fuel line either to clear it or blow it off the end of the fuel pickup.
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Tuned
Joined: Dec 2017
Posts: 387
Likes: 22
I did blow a little bit into the tank. Maybe I'll try more.
Mountain Pass
Joined: Aug 2017
Posts: 138
Likes: 12
From: Walnut Creek
This very issue just happened to my '63 F250 with stock tank and electric pump.
In the end it had nothing to do with the pump; everything to do with the tank. Sediment was blocking the out and was only dislodged by removing the line from the "FUEL IN" side of the pump and blowing back through toward the tank. That dislodged the sediment and... my '63 is back and operational. However, the sediment is still in the tank and I'm now researching new tank options (behind the seat replacement, under the bed, multiple tanks, etc...) to completely correct the problem.
Good luck!
In the end it had nothing to do with the pump; everything to do with the tank. Sediment was blocking the out and was only dislodged by removing the line from the "FUEL IN" side of the pump and blowing back through toward the tank. That dislodged the sediment and... my '63 is back and operational. However, the sediment is still in the tank and I'm now researching new tank options (behind the seat replacement, under the bed, multiple tanks, etc...) to completely correct the problem.
Good luck!
Thread Starter
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Tuned
Joined: Dec 2017
Posts: 387
Likes: 22
This very issue just happened to my '63 F250 with stock tank and electric pump.
In the end it had nothing to do with the pump; everything to do with the tank. Sediment was blocking the out and was only dislodged by removing the line from the "FUEL IN" side of the pump and blowing back through toward the tank. That dislodged the sediment and... my '63 is back and operational. However, the sediment is still in the tank and I'm now researching new tank options (behind the seat replacement, under the bed, multiple tanks, etc...) to completely correct the problem.
Good luck!
In the end it had nothing to do with the pump; everything to do with the tank. Sediment was blocking the out and was only dislodged by removing the line from the "FUEL IN" side of the pump and blowing back through toward the tank. That dislodged the sediment and... my '63 is back and operational. However, the sediment is still in the tank and I'm now researching new tank options (behind the seat replacement, under the bed, multiple tanks, etc...) to completely correct the problem.
Good luck!
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