Fuel tank problem or not?
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Fuel tank problem or not?
When I fuel up and open the cap on the filler neck I always hear a hiss. Never could figure if it was pressure or vacuum. Today, after changing oil, I opened my fuel filter bleeder to check for water and it just started slurping and gurgling with no diesel coming out. I lowered the truck, removed the fuel tank filler cap and heard the hiss. Raised back up and opened the filter bleeder and diesel came out. I now know the hiss is a vacuum. Is this normal? If this tank is vented I have a problem somewhere.
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
When I fuel up and open the cap on the filler neck I always hear a hiss. Never could figure if it was pressure or vacuum. Today, after changing oil, I opened my fuel filter bleeder to check for water and it just started slurping and gurgling with no diesel coming out. I lowered the truck, removed the fuel tank filler cap and heard the hiss. Raised back up and opened the filter bleeder and diesel came out. I now know the hiss is a vacuum. Is this normal? If this tank is vented I have a problem somewhere.
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
I don't get a hiss when I open the gas cap
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
Mine does it all the time if I take the fuel cap off right after shutting it down unless I let it sit and idle for a while before opening it up or let it sit after shutting it down.
So far there hasn't been any issues from it.
So far there hasn't been any issues from it.
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Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Mine seems to depend on tank level. I was 44 miles from empty today and it had quite a vacuum. It had sat about three hours before I cracked open the fuel drain valve and then the filler cap later.
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
I almost never take the fuel cap off unless the tank is empty and I'm fueling it up, so I couldn't tell you much about when it has a lot of fuel in it.
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