Super hot air pressure coming out of gas cap

Asked by GuruF3177 May 07, 2020 at 10:12 AM about the 1992 Dodge Caravan C/V Cargo FWD

Question type: Maintenance & Repair

I have a 92 dodge caravan it just quit running
and have fixed and replaced may parts . Now I
can get it to start only by flooring gas pedal it
starts but has a huge loud sucking noise  
through throttle  body,runs rough  and black
smoke out of tail pipe and now iam getting
super hot air pressure coming out when gas
cap isn't on I mean it's so hot that it would
burn ur skin cant figure this thing out and
either maybe u guy can help me or iam going
to junk it

1 Answer
101,595

KenF answered 3 years ago

Fuel can vaporize from heat and movement and can build up pressure in a tank that isn't properly vented. A failed EVAP system can prevent venting. The pressure build up can cause the tank or fuel lines to rupture or leak, which raises the chances of a fire. I would consider this vehicle very unsafe to drive. The black smoke, rough running, and fuel vapor pressure may be related but then you may have multiple problems. The only way to know is to conduct a thorough check of the EVAP system, fuel delivery system, and throttle body, which may or not be worth it on a nearly 30 year old Chrysler product.

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