Gas cap for 4.0l or MPI conversion - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-08-2002, 08:37 AM Thread Starter
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Gas cap for 4.0l or MPI conversion

What gas cap should be used with a 4.0L conversion in a 1982 CJ-7? The original cap will "vent" on hot days & slow trail riding, when relieving the pressure I can actually here the fuel boil in the tank (metal 16 gal) Is this normal?

1990 XJ 4.0L (non-HO)with MPI system
Fuel supply right side of frame, return on left
Still working on spark knock

Thanks,

GaryM
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post #2 of (permalink) Old 09-08-2002, 09:34 PM Thread Starter
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Re: Gas cap for 4.0l or MPI conversion

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post #3 of (permalink) Old 09-09-2002, 08:09 AM
 
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Re: Gas cap for 4.0l or MPI conversion

I use just a regular parts store locking cap, I think it is vented because it will dribble some when I'm verticle.
But, if you hooked everything in your MPI kit up the vent lines from the top of your tank should go to your charcoal canister and relieve to your MPI's intake manifold.
A little positive pressure in that metal tank souldn't be harmful.
Just don't make the mistake of topping off your tank by trying to squeeze more fuel into it past the first time the gas station's nozzle pops off.
That practice will cause your canister to fill with liquid gasoline and ruin it.
Good advice for any modern (canister equipped) car ... [img]images/icons/smile.gif[/img]
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