91 Mustang Gt Fuel Smell When Ac Is On

[Imatk]

So far I've replaced the tank and seal around the tank and I still have a gas odor coming into the car when the AC is on.

Does anyone know what this would be?

Thanks

 

[Noobz347]

The A/C inlet is near your cowl and if you're only getting odor when the A/C is on then I'd say that you have a fuel leak under the hood. Check for leaks at your rails, injectors, regulator, and upper plenum.

 

[Imatk]

Ok I'll give it a shot and see if I can see anything.

What would be the best way to check for leaks?

 

[Noobz347]

Eyes and nose if it's under the hood.

Pop and prop it, then cycle the ignition switch a few times to build up pressure.

 

[Imatk]

Ok so don't run it and look for them, just cycle the switch and look?

 

[Noobz347]

Ok so don't run it and look for them, just cycle the switch and look?

Yep... try that first. It's more difficult to catch a small leak with the engine running.

 

[Imatk]

Ok will do thanks!

 

[HISSIN50]

Also look for an opening in the EVAP circuit. The fuel degrades the lines and the canister can crack. The canister is in the front passenger corner (kinda under the air filter area) and the purge line runs through the solenoid and to the underside of the front of the air plenum.

 

[a91what]

Yes check that charcoal canister!! I had a terrible fuel smell in my vert. pulled out the canister and turned it upside down, the charcoal that came out ( like sprinkles) reaked of fuel. Now no more smell.