FUEL TANK PURGING
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Lead Driver
Joined: Oct 2016
Posts: 6,185
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From: Houston/Sugar Land
FUEL TANK PURGING
I have read about my issue and don't have a target solution yet.
Today my front tank was just below 1/4. I started adding fuel and after less than a minute it started to purge. I stopped it and resumed filling without incident. It happened once before awhile ago.
The tank only registered 1/4 tank when I left and after 5 miles it went to the proper level for the fuel I had added. This has been happening the last few times I have added fuel to the front tank. I and several here on the forum attributed this to a sticking float. I don't think this is associated with the purging, but I don't know.
Any idea of what might be causing the purging? Gas cap is a fairly recent Motorcraft. Rear tank works as it should. Thank you in advance.
Today my front tank was just below 1/4. I started adding fuel and after less than a minute it started to purge. I stopped it and resumed filling without incident. It happened once before awhile ago.
The tank only registered 1/4 tank when I left and after 5 miles it went to the proper level for the fuel I had added. This has been happening the last few times I have added fuel to the front tank. I and several here on the forum attributed this to a sticking float. I don't think this is associated with the purging, but I don't know.
Any idea of what might be causing the purging? Gas cap is a fairly recent Motorcraft. Rear tank works as it should. Thank you in advance.
Cargo Master
Joined: Nov 2009
Posts: 2,190
Likes: 620
Honestly, I don't have a good read on what the issue might be. I had some similar issues with the rear tank on my '92 Due to a pinched off vapor line where a PO had crushed the bed down on top of the soft line. Maybe check that you don't have an obstructed vent? I will say, and I'm not being paid to say this, I run a bottle of Chevron Techron additive through my OBS trucks about every third or fourth tank, just to keep the sending units happy. I don't know what Chevron puts in there, or if I'm just lucky, or if it's confirmation bias, could be anything, I'm neither a chemist, or petrochemical engineer, but I've had it both "bring back" senders from the dead, and keep them from weirdness.
Thread Starter
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Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Thank you. I will check it out. When I posted about the possible stuck float, I had mentioned I used some MMO and it started working. You replied you had success with it also. Think the Chevron might be better since the problem returned?
Cargo Master
Joined: Nov 2009
Posts: 2,190
Likes: 620
Thread Starter
|
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Honestly, I don't have a good read on what the issue might be. I had some similar issues with the rear tank on my '92 Due to a pinched off vapor line where a PO had crushed the bed down on top of the soft line. Maybe check that you don't have an obstructed vent? I will say, and I'm not being paid to say this, I run a bottle of Chevron Techron additive through my OBS trucks about every third or fourth tank, just to keep the sending units happy. I don't know what Chevron puts in there, or if I'm just lucky, or if it's confirmation bias, could be anything, I'm neither a chemist, or petrochemical engineer, but I've had it both "bring back" senders from the dead, and keep them from weirdness.
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