Fuel Pump Issues regarding heat???
#801
Supreme Member
Re: Fuel Pump Issues regarding heat???
Hello TGO, I have the fuel tank boiling/over-pressurizing issues as well. Was more noticeable after the flowmaster 80 series muffler install. Stock shields in place and the muffler has the proper clearance from the shield. Called Flowmaster, they do not sell the additional shield(s) anymore and the guy at the counter got a lesson from me on the issue. he said if it was a common problem they would get 10 calls a day. I said i'm surprised they don't, LOL. I would like the additional shielding. Maybe ebay...
Amazon has the Flowmaster heat shield. Call flowmaster and find out what one fits the 80, width wise. They have one that's a bit to long but it's better because it overhangs the muffler a few inches on either side. I can't remember the number but I have it. Also, Amazon has Thermotec heat shield material. It's a silver/mylar type thing. Comes with plastic push pins. I installed that on my original heat shield. It's a sheet that you cut to fit. So I have the factory shield, with the Thermotec, and the flowmaster shield on top of the muffler.
#802
Re: Fuel Pump Issues regarding heat???
Amazon has the Flowmaster heat shield. Call flowmaster and find out what one fits the 80, width wise. They have one that's a bit to long but it's better because it overhangs the muffler a few inches on either side. I can't remember the number but I have it. Also, Amazon has Thermotec heat shield material. It's a silver/mylar type thing. Comes with plastic push pins. I installed that on my original heat shield. It's a sheet that you cut to fit. So I have the factory shield, with the Thermotec, and the flowmaster shield on top of the muffler.
#803
Supreme Member
Re: Fuel Pump Issues regarding heat???
Delco 17075855. I found a NOS one on eBay last year. It's a tough find. I wouldn't even consider a used one. You may have to find a none stock one that will work.
#804
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Re: Fuel Pump Issues regarding heat???
Just search for it, and put your car info in.
This one is the one for my car, probably same for yours since they don't sell them without the silonoid anymore I don't think. If not, may be adaptable to work since the other p/n is hard to find.
https://www.amazon.com/gp/product/B000C9K3J2/
#805
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Re: Fuel Pump Issues regarding heat???
Thanks for the info! Ordered! as for the canister, i found one part number 17092109 for TPI cars
#806
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Car: 1987 Iroc Z28 Camaro
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Re: Fuel Pump Issues regarding heat???
Hello TGO, I have the fuel tank boiling/over-pressurizing issues as well. Was more noticeable after the flowmaster 80 series muffler install. Stock shields in place and the muffler has the proper clearance from the shield. Called Flowmaster, they do not sell the additional shield(s) anymore and the guy at the counter got a lesson from me on the issue. he said if it was a common problem they would get 10 calls a day. I said i'm surprised they don't, LOL. I would like the additional shielding. Maybe ebay...
https://www.summitracing.com/parts/dei-050130
#807
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Re: Fuel Pump Issues regarding heat???
I live in So Flo where we get mid 90's with 100+ heat index's. I DD my car and sometimes for long distances. The first thing that needs to work properly is that UFO valve. I don't think you can buy them but you can remove it and clean it so it functions properly. This is what controls that tank pressure. Someone posted in another thread that he rep;aced his with an old school vent that just vents into the atmosphere. You can't do this if you are in an emission state. I think the OP is right on with modern fuels being the problem. I don't know if this is witchcraft or coincidence but I am old school and I use Marvel Mystery oil EVERY time I fill up. The other day I was out of it and filled the tank. On my way home after about 20 min and my engine temp reaching 220 I heard that "whine" over the exhaust when I came to a stop. The noise continued the rest of the way home. I thought the pump was dying. The next morning I started the car and no whine. I stopped that day and restocked the Marvel Mystery oil, treated the tank of fuel and 3 tanks later no fuel pump noise. The car hit 230 the other day and no whine whatsoever.
#808
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Re: Fuel Pump Issues regarding heat???
ok, reporting back... so installed the flowmaster shield. Still boils or bubbles when hot. Going with heat stick-on shield for the tank next. Found pressure relief in changing to things: went to a 1998-up fuel tank pressure valve. It is Green. lets pressure out sooner. The older white ones let pressure build up too much. Then changed the cap to stant NAPA p/n 7031623. Pressure does not build up even close. Still do not like the boiling in the tank though.... may need to wait until next summer to test the next steps.
#809
Re: Fuel Pump Issues regarding heat???
ok, reporting back... so installed the flowmaster shield. Still boils or bubbles when hot. Going with heat stick-on shield for the tank next. Found pressure relief in changing to things: went to a 1998-up fuel tank pressure valve. It is Green. lets pressure out sooner. The older white ones let pressure build up too much. Then changed the cap to stant NAPA p/n 7031623. Pressure does not build up even close. Still do not like the boiling in the tank though.... may need to wait until next summer to test the next steps.
#810
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Car: 1987 Trans Am
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Re: Fuel Pump Issues regarding heat???
#811
Re: Fuel Pump Issues regarding heat???
yeaaa, I think u have the excact same problem as me, your car is fine on a cooler day like 75 and below right? I think the heat of the day mixed in with exhaust heat and heat soaked fuel getting returned to the tank makes for an interesting drive lol. You need to reroute your return line that should help you out a lot if not fix your up
#812
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Car: 1987 Trans Am
Engine: 355 Edel Int, SLP, Edel heders 8PSI
Transmission: T5
Axle/Gears: 3.45 Borg Warner
Re: Fuel Pump Issues regarding heat???
yeaaa, I think u have the excact same problem as me, your car is fine on a cooler day like 75 and below right? I think the heat of the day mixed in with exhaust heat and heat soaked fuel getting returned to the tank makes for an interesting drive lol. You need to reroute your return line that should help you out a lot if not fix your up
#813
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Re: Fuel Pump Issues regarding heat???
What's your fuel pressure?
Not sure why anyone has this problem and yet it's not 100%. It's unlikely a design flaw unless it's confined to certain regions or certain vehicle combinations.
Not sure why anyone has this problem and yet it's not 100%. It's unlikely a design flaw unless it's confined to certain regions or certain vehicle combinations.
#815
Re: Fuel Pump Issues regarding heat???
#817
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Car: 1987 Trans Am
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Re: Fuel Pump Issues regarding heat???
fuel pressure is 46 unplugged, 40 plugged. i was going to go higher but that may make it worse.
#819
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Car: 1987 Trans Am
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Re: Fuel Pump Issues regarding heat???
so last few weeks the weather in Colorado was hot. I went for a few drives and now when i cruise across town and sit in traffic the fuel pressure vent starts making a loud noise and the fuel vapors are unbearable. I have not rerouted the return line yet. Can't see how this needs re-engineered. I am rebuilding the ENTIRE evap system today with all new gm parts. Will report back. I am once again at a loss with this stupid car
#820
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Re: Fuel Pump Issues regarding heat???
I have had this problem for 7 years, turns out the solenoid valve to the eval canister had died, a $30 part, solved this for me. No more pressure, boiling, vent noises, or poor idle.
#821
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Car: 1991 RS/1991 Z28
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Re: Fuel Pump Issues regarding heat???
Gotta keep this thread alive. I had this issue last summer twice and once so far this summer. Only on 90+ degree days here in Michigan in stop and go traffic. I am getting a bad smell of fuel in the car, tons of pressure when I remove the fuel cap, whiny sound coming from the tank, and poor idle or stalling. Once the car cools off it will start right back up and run perfectly. I guess I will start with a new canister and start replacing stuff from there.
#822
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Car: 82 Trans Am; 83 Daytona Pace Car
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Re: Fuel Pump Issues regarding heat???
Listen for a click when you turn the car off, from the drivers side fender, that will indicate the solenoid valve is working...
#824
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Re: Fuel Pump Issues regarding heat???
I live in Central Florida and DD my car. I have been experiencing the same fuel overheating issue, so i replaced the pump with a new AC Delco, and it is doing the same exact thing. My canister works correctly, FP regulator is working, 20 Amp fuel pump fuse cleaned up, fuel pump relay replaced. The fuel is the problem, I put Marvel Mystery oil in it, and it took the fuel pump cutting out away.
#825
Re: Fuel Pump Issues regarding heat???
I live in Central Florida and DD my car. I have been experiencing the same fuel overheating issue, so i replaced the pump with a new AC Delco, and it is doing the same exact thing. My canister works correctly, FP regulator is working, 20 Amp fuel pump fuse cleaned up, fuel pump relay replaced. The fuel is the problem, I put Marvel Mystery oil in it, and it took the fuel pump cutting out away.
#826
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Re: Fuel Pump Issues regarding heat???
I don't think there was a typo. I believe that JCB250R is saying that the addition of Marvel Mystery oil prevented his car from doing the 'ol "fuel-overheating/vaporizing and then the car stalls trick" that so many of us have experienced and have come to love with a passion. One of the theories is that, the 10/15% ethanol added to modern fuel does not 'get along' with TPI and that switching to 100% gas (hard to find) or adding something like Marvel can fix the root cause. For example, my gas tank vent valve is just fine, but the car would still overheat the fuel and stall out on hot days. Using 100% gas, if you can find it, is worth a try for those battling this issue.
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