gas tank help
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Junior User
Joined: May 2013
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gas tank help
ok so first all you guys are awesome have gotten a lot of help but this is still troubling me 78 f100 current tank is leaking it has the top vent in tank that goes to the charcoal filter next to alternator problem is the filter is gone and line is plugged already has vented gas cap on to make up for plugged line .
so do i get new tank with out hole? or get one with and new filter and cap?
ps runs like a champ atm lil rich but haven't gotten into carb much yet
so do i get new tank with out hole? or get one with and new filter and cap?
ps runs like a champ atm lil rich but haven't gotten into carb much yet
Postmaster
Joined: Mar 2011
Posts: 2,698
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From: Taxachusetts
Since you have to pull the tank, why not weld the leak(s), weld a patch from some 18 gauge sheetmetal over the vent hole and be done.
Since you have a vented cap already (and if the current tank is too far gone to weld it), get a new non-vented tank. Less moving parts to worry about.
But, that's just my opinion.
Since you have a vented cap already (and if the current tank is too far gone to weld it), get a new non-vented tank. Less moving parts to worry about.
But, that's just my opinion.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Evap/Em fuel vapor valve located in top of tank. Vapor hose routes along right frame rail from vapor valve to valve on charcoal canister.
Corrogated paper hose routes from valve on canister to elbow on air cleaner.
Valve available from Ford and auto parts stores.
If UT requires smog test, verify valve is necessary before plugging hole.
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Junior User
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ok so got new tank no Evap/Em fuel vapor valve installed easy.
BUT it started building pressure in the tank creating fuel spray out of cap when opened on occasion but mostly just pressure.
picked up a new stant 10574 fuel cap now i am getting fuel drip out of cap inspected it rubber seal is shot after a month.
bad cap? yea probably. but why am i pushing fuel out and were there diffrent size filler necks?
ps no issues whal driving
only had problems starting when i used gas from a station that just found water in there tanks and had them "flushed" glad i didnt fill up
BUT it started building pressure in the tank creating fuel spray out of cap when opened on occasion but mostly just pressure.
picked up a new stant 10574 fuel cap now i am getting fuel drip out of cap inspected it rubber seal is shot after a month.
bad cap? yea probably. but why am i pushing fuel out and were there diffrent size filler necks?
ps no issues whal driving
only had problems starting when i used gas from a station that just found water in there tanks and had them "flushed" glad i didnt fill up
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Evaporative Emission: Unleaded fuel, non vented fuel cap.
Back then there were two different sizes of gas station nozzles. Nozzle used with leaded gas was larger in diameter than used with unleaded.
Lead in gas melted charcoal in Evap/Em canisters (and catalytic converters).
Fuel filler tube used with unleaded gas had a restrictor...that would not allow a leaded gas nozzle to fit in.
Note: Hot weather causes gas to expand, so don't fill the tank all the way or some will spit out once the cap is removed.
Back then there were two different sizes of gas station nozzles. Nozzle used with leaded gas was larger in diameter than used with unleaded.
Lead in gas melted charcoal in Evap/Em canisters (and catalytic converters).
Fuel filler tube used with unleaded gas had a restrictor...that would not allow a leaded gas nozzle to fit in.
Note: Hot weather causes gas to expand, so don't fill the tank all the way or some will spit out once the cap is removed.
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Junior User
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ok so in that case a unleaded cap would not fit a leaded neck so its not that my neck is to big its just fail cap is there a more reliable brand something that's made last year or 2 maybe or a way to try and save rubber cause pepboys only had 2 in warehouse stock so my return will get me same problem i believe
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