GAS SMELL IN MY '70 CAB
#1
07-27-2012, 07:04 PM
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GAS SMELL IN MY '70 CAB
i just bought a '70 f250, and every once in awhile it gets a really strong gas smell in the cab. it does it when i drive it and even when it is just parked. i was told that the behind the seat tank should have a vent from the top to the filler neck. i dont see one. not sure if i should just take it to a mechanic and see if it is a leak or if i should just have a vent installed myself.
#3
07-28-2012, 04:44 AM
+1 on the rubber hose between the tank & metal filler tube.
Another issue to all, do not fill your trucks gas tank when you are unable to drive 3-5 gallons out. The extreme heat that we are having currently causes the gas in the tank to expand and pour out on the ground at the filler cap.
Should you find yourself in a spot where your gas is running out, move the truck to a place where the drivers side is higher. You can park the left rear wheel on the curb in a parking lot. Gas cost too much to pour it out.
John
Another issue to all, do not fill your trucks gas tank when you are unable to drive 3-5 gallons out. The extreme heat that we are having currently causes the gas in the tank to expand and pour out on the ground at the filler cap.
Should you find yourself in a spot where your gas is running out, move the truck to a place where the drivers side is higher. You can park the left rear wheel on the curb in a parking lot. Gas cost too much to pour it out.
John
#4
07-28-2012, 04:55 AM
I just bought a '70 F250, and every once in awhile it gets a really strong gas smell in the cab. it does it when I drive it and even when it is just parked.
I was told that the behind the seat (in-cab) tank should have a vent
from the top to the filler neck.
BS! No such thing exists.
I dont see one.
Of course you don't, because there isn't one!
I was told that the behind the seat (in-cab) tank should have a vent
from the top to the filler neck. BS! No such thing exists.
I dont see one.
Of course you don't, because there isn't one!
Between the filler neck and the in-cab fuel tank is a neoprene rubber filler hose, it's clamped on.
Over time the hose swells up, cracks. Where the clamps are located, it age cracks.
There is no vent in the in-cab tank, because: The fuel cap is vented!
The hose is reproduced, it's the same for all in-cab fuel tanks from 1957 thru 1972. Also used on 1937/48 Ford & 1939/48 Mercury Passenger Cars and 1948/56 trucks.
Available from all the repro parts sellers for about 10 bucks.
#5
07-28-2012, 09:15 AM
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#6
07-28-2012, 10:41 AM
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#7
07-30-2012, 11:09 AM
Neoprene inlet hose is my guess.
Fuel tank sender gaskets can fail, expecially if you've been trying to diagnose a guage fault and pulled the sender out.
Another possibility is the selector valve (assuming that you have two gas tanks). Swapping out the old valve for a new one usually fixes that.
As for tank overflow, I've had that happen lots of times, and I suspect that the gas can follow the metal filler tube back inside the cab.
Basically, if you smell gas, you've got a safety problem (even if you dont smoke).
Fuel tank sender gaskets can fail, expecially if you've been trying to diagnose a guage fault and pulled the sender out.
Another possibility is the selector valve (assuming that you have two gas tanks). Swapping out the old valve for a new one usually fixes that.
As for tank overflow, I've had that happen lots of times, and I suspect that the gas can follow the metal filler tube back inside the cab.
Basically, if you smell gas, you've got a safety problem (even if you dont smoke).
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