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What would cause extreme fuel foaming on fill today?

9331 Views 11 Replies 5 Participants Last post by  pscianna
It literally took me more than an hour to drizzle 36 gallons of diesel fuel into my tank today on fill valves that could be adjusted to a very slow rate.

The two unusual events were that:
(1) I ran it lower than I normally do before refill.
(2) This was to be sure and maximize the benefit of my one every 10,000 mile bottle of Ford Lubricity Additive that I just added to my previous fill.

I tried 2 different pumps at each of the 2 different stations that I visited. I have not dropped my tank yet to shorten the vent dip tube but historically only the last 5 gallons or so have been a PITA to get in.

This happened one time before several years ago in the winter when filling up in Ely on a trip to Idaho. I could not get two tenths of a gallon in without foam almost spraying back out and shutting down a very low flow adjusted fill valve. That time I just moved to another pump and it filled totally normal.

I am going to drop the tank and snip the vent tube and do some kind of fuel pickup mod when things slow down for me.

Any ideas as to what happened today? /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif
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When you pump the fuel in the air has to have some place to go. If the vent tube is blocked the path of least resistance is back out the fill neck. This will happen as soon as you try and displace the air, which is right away. You have a blocked vent. Try holding the nozzle to the side so the air can escape you will probably not have the problem then!!
The only thing left is the vent tube and since you cannot think of anything to cause this it is probably an insect in there. In this case usually holding the nozzle a certain way for the air to escape will work, maybe not in your case but normally it does. You need to also reduce flow the air escaping is equal to the fuel entering, basic physics. I hope you get it figured out and let us know what it is that fixs your problem.
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