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car only runs without gas cap by ColinsFiero
Started on: 08-06-2013 04:30 PM
Replies: 6 (382 views)
Last post by: ColinsFiero on 08-09-2013 05:26 PM
ColinsFiero
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Report this Post08-06-2013 04:30 PM Click Here to See the Profile for ColinsFieroClick Here to Email ColinsFieroSend a Private Message to ColinsFieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have the strangest problem... And I'm finally convinced that it is the gas cap. I went to get the car smogged and they were testing the emmisions everything was fine and they took the gas cap off while the car was running and it died. I figured it over heated so I waited and started it up again and drove it home. I was curious why it died at that time so for a test i took the gas cap off again while it was running and it died again. Weird...I Left the gas cap off and it started right up after which if i usually leave it one i have to wait an hour....

When I drive the car around ten miles it will die and the fuel pump squeals every time for sometime now. I replaced the fuel pump but no change I tried taking the gas cap off one night and drove around all night and the car ran fine. So for a temporary fix i rubber banded a cloth over where the gas cap used to be to get air in the tank and it runs great i can go 300 mile no problem but right when I put the gas cap on the car runs like hell.... and I've been testing this for a month so it is no coincidence!

Any help?
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Gall757
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Report this Post08-06-2013 04:55 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Welcome to the Forum! What year is your car?
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Bloozberry
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Report this Post08-06-2013 04:57 PM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
Most likely the vent line from the gas tank or the charcoal canister is plugged. Either one will cause a vacuum in the system that will eventually be strong enough to prevent the pump from delivering 45 psi to the injectors.
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rbell2915
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Report this Post08-06-2013 07:16 PM Click Here to See the Profile for rbell2915Click Here to Email rbell2915Send a Private Message to rbell2915Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Bloozberry:

Most likely the vent line from the gas tank or the charcoal canister is plugged. Either one will cause a vacuum in the system that will eventually be strong enough to prevent the pump from delivering 45 psi to the injectors.


Agreed. Something must be plugged somewhere.
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fierofool
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Report this Post08-06-2013 08:13 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
Topping off the tank can saturate the Evap tank and eventually give problems. Also, one of our locals was having a similar problem with his car shutting down after a short drive and he removed the Evap tank and purged it with compressed air. He said there was a thick rusty brown muck that blew out of it. He was glad he disconnected it from the tank and fuel system. After that, he had no more problems.
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rogergarrison
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Report this Post08-07-2013 04:22 PM Click Here to See the Profile for rogergarrisonClick Here to Email rogergarrisonSend a Private Message to rogergarrisonEdit/Delete MessageReply w/QuoteDirect Link to This Post
I dont know if Fieros have a vented cap or not. You may have the wrong cap or the hole is plugged. Id also blow out the return lines. I know on later model Mopars theres an 'O' ring at the top of the tank as part of the emmissions system for a hose that goes up to the intake. If you 'top' the tank off, that seal shrivels up. Its meant to seal the hose airtight, not be immersed in gas. I think they replaced it now on new models. The seal if it goes bad cant be replaced because its put in when the tank is being manufactured. I always topped off at stations and my Magnum started cutting out like that. They replaced the $700 gas tank under warranty. Now I leave it after it autoclicks off, and never top one off. I dont know what other cars have a similar setup...but it was a bad design.
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ColinsFiero
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Report this Post08-09-2013 05:26 PM Click Here to See the Profile for ColinsFieroClick Here to Email ColinsFieroSend a Private Message to ColinsFieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
thanks guys ill check to see it it is plugged anywhere I am new to this forum its an 1986 fiero base model but the GT v6 engine put in also i put the gt steering wheel on it as well ill check all the lines evap tank and see what happens
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