i cant seem to solve this one so i am asking all off you i have a 1991 z28 with the 350 tpi
and the problem is starts but then when i leave it in the sun for a while and it gets hot it wont start and seems to be pouring gas into the engine i have already changed the fuel regulator and checked all the fuel injectors it will start right now becasue its in my garage but when i leave it outside idk what goes on but in wont start so hopefully someone out there can help me i am willing to try anything you guys can think of.

 

when it doesnt start, do you have spark?

 

yes i do plus there are new sparkplugs fairly new wires and new cap

 

alright did some research on the internet for a few hours trying to see if anything would come up and i found this

it had the same symptoms as mine it would start and run fine but when it was hot it wouldnt start and was pouring gas into the engine it was said to confuse many people and the solution was that the coolent sensor was bad and when it got hot it would cause the fuel not to go into a closed loop and just let gas pour into the engine
the reason i post this is does this sound like it could be a the reason or does it sound to good to be true

 

anybody???

 

I suppose it sounds feasable. I had a simaliar problem with a '90 Honda Accord, Yeah I know its a different animal but. If I opened the door and let the hot air out for a few minutes it would start. Turned out the parts counter guys at the Honda dealership were all to familiar with this. The Honda had a Main Relay located under the dash board and when it got old it would warp internally, work properly in moderate temps. but close up the car and pour on some sun and it would not connect the ign. to the distributor.

 

yea i installed it today because when i went to buy the part it was only $15 so i thought why not give it a shot and till now it seems to be better the real test will come tomorrow when it sits in the hot sun because we already got the engine up to temp and it still starts fine without the smell of gas

 

still wont start after sitting in hot sun i am out of ideas

so i would love to hear any other suggestions or ideas on what it could be becasue i am stumped

 

Wild story. our cars are getting old and they are telling it on us. I wonder if the gas tank vent is stopped up and is filling the engine with vapors giving the MAP sesor a false reading. I have seen charcoal canister filter on the battom stop up and the engine sucked charcoal into the intake manifold. Would be easy to check by leaving the gas cap loose while parked in the sun.