I went out to my truck and found the gas coming out of the fill spou, like it was being forced out. It has eaten away my paint and screwed it up pretty good. There seems to be a lot of pressure in there. The fuel filter is remaining full, but it used to drain back out when parked. I need to know why there is so much pressure. The truck is a 62 with a 223 engine and everything is pretty much stock. Help!!!!

 

If you park on a hill and the driver's side is on the downhill side, this will happen when you have a full tank. Either make sure that when you park the filler neck is on the uphill side or don't fill the tank all of the way up.

 

Full tank at night, when it gets hot it expands and spews, it will take you a time or 2 to remember that, then I only fill up before I do run around and go home so I use a few gallons, and even then, I still park with the filler necks UPHILL. My 63, my 66, and my 77 ALL do it with a full tank/tanks. Mainly only in summer, but have had it happen in winter when cold in a.m. and I filled up right before I got to work, warmed up and she starts spewing. Then you get to drive home smellin like a molotov cocktail,,,

 

Thanks for the input friends. I was afraid I had overfilled it and not driven off enough before it warmed up. I may have to keep that tank around 1/2 during the summer, but unfortunately my paint job is still messed up. .

 

Get a new fuel cap.. it should allow for vacuum ventilation but not purge ventilation unless you over filled it... Fuel tanks should not be filled more than 82-87% due to expansion... If you fill early in the morning fill it only 75% Cool summer mornings with hot summer afternoons are the toughest time...

 

I had just bought a new locking gas cap from so-cal speed shop that was supposed to be made for my truck and I filled the truck up last night around 3 or 4 so it was already pretty hot. Maybe it was completely full, but I had driven a good 10 miles before it was parked and did this. I think that the design of the street leaned in to the fill side and that made things worse. I'm hoping that filling less will help but now I'm going to have to fix the paint. Tough lesson.

 

Brother, Do not fill your truck up in warmer weather when you are not going to drive 3-5 gallons out before parking it. Don't spend a bunch o money on expensive caps. Always park the truck drivers side high when there is a lot of gas in the tank. You cam run the rear wheel up on a curb in a parking lot to make it high.

This is something that occurred in behind the seat tanks. I first saw it in the 1950s with my dads truck.

You can use a couple choices don't fill it up or spend a lot of money on caps that don't work.



John

 

Learned the lesson myself.
Had to have the corner of my pickup cab repainted.......
Apparently I am a slow learner.....
I done it a couple times, but fortunately I caught it before it ruined the paint agian

 

That's why I stayed with the "patina'd" look!!

 

Did'ja all notice where the OP lives? Phoenix Arid-Zona .. where it can be 95 degrees...at midnight! Daytime temps can reach 115 degrees....or more.

Heat causes gasoline to expand, so when you fill the tank all the way up (18 gallons as original), some will leak out. A very common problem on these trucks.

 

Hey now, It is a dry heat.......It is only 101 as i type......

3/4 to 7/8 full at the max around here.

Garbz

 

I was having the same problem found a tight fitting gas cap at my local parts store and it only cost me 6.99. No issues since!