Fuel heating up
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Fuel heating up
I'm a C3 guy, but recently converted to FI. Since the early TPI's are close to our engines, I though I ask around here.
How hot does the fuel get with your TPI ? In mine the injectors and fuel rails seem to heat up the fuel some. It makes the fuel evaporate in the fuel tank and causing some pressure in the tank.
Thanks
How hot does the fuel get with your TPI ? In mine the injectors and fuel rails seem to heat up the fuel some. It makes the fuel evaporate in the fuel tank and causing some pressure in the tank.
Thanks
Advanced
Joined: Aug 2013
Posts: 63
Likes: 1
I don't see this on my 86.
I would be concerned that there is a potential for a fire from this condition. Do you have a fuel pressure regulator and a return line in your set up. If the pump is dead heading, this could cause this.
I would be concerned that there is a potential for a fire from this condition. Do you have a fuel pressure regulator and a return line in your set up. If the pump is dead heading, this could cause this.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Yes I have a return line and fuel pressure regulator.
Instructor
Joined: Aug 2013
Posts: 156
Likes: 1
From: Springfield MA
My '85 does that. especially after a long drive. My research tells me that this can happen if the regulator / return line are after the fuel rails (stock TPI). the theory is that the fuel heats up in the rails, and is then returned to the tank. google "fuel rail plumbing" and you'll find horror stories where guys had to pack their fuel line in ice. i'm going to try to put an aftermarket regulator before the rails, and deadhead the rails. there appears to be pros and cons to each method.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
My '85 does that. especially after a long drive. My research tells me that this can happen if the regulator / return line are after the fuel rails (stock TPI). the theory is that the fuel heats up in the rails, and is then returned to the tank. google "fuel rail plumbing" and you'll find horror stories where guys had to pack their fuel line in ice. i'm going to try to put an aftermarket regulator before the rails, and deadhead the rails. there appears to be pros and cons to each method.
Only difference is, due to the fuel tank in a C3 not being baffled, I had to use a fuel surge tank which is mounted in the right fender. So a low pressure pump feeds and returns fuel from the surge tank to the main tank, the high pressure pump feeds of the surge tank and the regulator returns it to the surge tank.
It was worse the first time I drove it a bit longer, so I mounted heat shielding to keep the hot air coming of the headers away. It's a lot better, but it seems like the engine is indeed putting in the rest of the heat.
Instructor
Joined: Aug 2013
Posts: 156
Likes: 1
From: Springfield MA
http://ls1tech.com/forums/conversion...-plumbing.html
I know new corvettes have the regulator near the gas tank.
I know new corvettes have the regulator near the gas tank.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Advanced
Joined: Aug 2013
Posts: 63
Likes: 1
Le Mans Master
Joined: Feb 2005
Posts: 6,481
Likes: 566
From: Clearwater Florida
..... On the C4 , the return fuel is routed into the sump in the fuel tank to be re-used by the engine rather than letting it heat up all the fuel in the tank ... you also need a working vapor recovery system ... charcoal canister and all the vacuum hoses and solenoids to prevent pressurizing the fuel tank and to control the vapors in regards to when they are allowed back into the intake manifold ... if its not hooked up correctly it can interfere with the operation of the engine ............
Le Mans Master
Joined: Feb 2005
Posts: 6,481
Likes: 566
From: Clearwater Florida
Hm, I Always thought that the fuel pressure regulator needed to be after the rails. That's how I have it hooked up.
Only difference is, due to the fuel tank in a C3 not being baffled, I had to use a fuel surge tank which is mounted in the right fender. So a low pressure pump feeds and returns fuel from the surge tank to the main tank, the high pressure pump feeds of the surge tank and the regulator returns it to the surge tank.
It was worse the first time I drove it a bit longer, so I mounted heat shielding to keep the hot air coming of the headers away. It's a lot better, but it seems like the engine is indeed putting in the rest of the heat.
Only difference is, due to the fuel tank in a C3 not being baffled, I had to use a fuel surge tank which is mounted in the right fender. So a low pressure pump feeds and returns fuel from the surge tank to the main tank, the high pressure pump feeds of the surge tank and the regulator returns it to the surge tank.
It was worse the first time I drove it a bit longer, so I mounted heat shielding to keep the hot air coming of the headers away. It's a lot better, but it seems like the engine is indeed putting in the rest of the heat.
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
Hot fuel
There was a Roadkill on Youtube that included this very issue. IIRC the cause was thought to be a high volume fuel pump or a small amount of fuel in the tank. It was the one with the Hemi Dodge and they were taking it drag somewhere. The temp solution was to pack around the fuel cell in the trunk to cool the fuel
May give you some leads on your problem.
Good luck.
May give you some leads on your problem.
Good luck.
Le Mans Master
Joined: Feb 2005
Posts: 6,481
Likes: 566
From: Clearwater Florida
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Well, I'm being told that the A1000 pump due to it's large capacity is also responsible for heating up of the fuel. The advice given was to use the Aeromotive speed regulator. Unfortunately this is a very, very expensive item.
Are there any alternatives ?
Are there any alternatives ?
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
This is a pretty good discussion on your exact problem. http://www.pro-touring.com/threads/2...lator-plumbing
Most of those guys also are using the A1000 pump. I think I'm gonna dead head my rails, but I'll still keep the FPR up by the engine because its convenient and I already have a return line.
Most of those guys also are using the A1000 pump. I think I'm gonna dead head my rails, but I'll still keep the FPR up by the engine because its convenient and I already have a return line.