Fi-tech won’t start when warm-please help
Thread Starter
Racer
Joined: Jul 2017
Posts: 399
Likes: 115
From: chico ca
Fi-tech won’t start when warm-please help
I have a fi-tech fuel injection on my 68 327. When cold starts up great, runs fantastic. But when it gets to 180-190 degrees and I turn it off, let it set for 10 min it won’t start until it cools down. Maybe an hour or two later. Really frustrating and when you call for help there is somebody that is no help at all telling you that it is something I did.... but they have know idea what it might be. Anybody else have this problem? Should have bought a sniper f.i.
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
I have a fi-tech fuel injection on my 68 327. When cold starts up great, runs fantastic. But when it gets to 180-190 degrees and I turn it off, let it set for 10 min it won’t start until it cools down. Maybe an hour or two later. Really frustrating and when you call for help there is somebody that is no help at all telling you that it is something I did.... but they have know idea what it might be. Anybody else have this problem? Should have bought a sniper f.i.
Thread Starter
Racer
Joined: Jul 2017
Posts: 399
Likes: 115
From: chico ca
Cranks over fine. Battery is at correct voltage. If there is a voltage drop it won't start. Fuel pump is noisy l so that seems to be fine, plus it works fine when car is started.
Last edited by Buttersvette; Jun 11, 2019 at 10:37 AM. Reason: forgot word
Drifting
Joined: Jul 2015
Posts: 1,765
Likes: 254
From: Catlett VA
Can you tell if the unit is actually getting liquid fuel or might it be vapor locked? I have an electric fuel pump on my 68 bb with carburetor and when the engine is hot and left standing for 15-30 minutes it takes a couple seconds for the fuel pump to push out the gas vapors and put liquid gas in the carb.
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
Can you tell if the unit is actually getting liquid fuel or might it be vapor locked? I have an electric fuel pump on my 68 bb with carburetor and when the engine is hot and left standing for 15-30 minutes it takes a couple seconds for the fuel pump to push out the gas vapors and put liquid gas in the carb.
Racer
Joined: Mar 2019
Posts: 327
Likes: 75
From: west mi. / ms. gulf coast
FiTech is a high fuel pressure system. It shouldn't have a vapor lock problem unless the fuel line is right on the engine. Check the fuel pressure and see if you have spark. A coil will lose voltage when it gets hot. Also if you have a stock distributor the condenser inside will cause a no start when hot, and start when it cools off. I have had both happen a couple of times.
Thread Starter
Racer
Joined: Jul 2017
Posts: 399
Likes: 115
From: chico ca
FI tech
Brand new hei dist. I think it has something to do with computer. I think there is temp related program in the computer. I was hoping there were some fI tech owners out there with the same problem.
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Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
there are modifiers in the program that add a % of fuel depending on temp to get it started, with a warm temp this shouldnt be your problem unless it is set to remove fuel (not sure its an option) when warm. If this uses the command center I have read that some with brands it needs to have a return line or the fuel in the command center can get hot an cause a vapor lock.
Melting Slicks
Joined: Aug 2016
Posts: 2,346
Likes: 1,174
From: CLEVELAND STUCK IN OHIO
2024 C3 of the Year Finalist- Modified
Have you tryed adding throttle when cranking, when you have the hot condition, ,
Also,, holding the gas pedal on the floor befor you turn key to ON position should cancel the priming shot of fuel, if you are still useing default settings,,,
But you really need to determine if you have spark and fuel, when cranking , , ,
This is my second driveing season with my FiTech, and am really enjoying it,, sorry to hear of your issues, ,,,,
Also,, holding the gas pedal on the floor befor you turn key to ON position should cancel the priming shot of fuel, if you are still useing default settings,,,
But you really need to determine if you have spark and fuel, when cranking , , ,
This is my second driveing season with my FiTech, and am really enjoying it,, sorry to hear of your issues, ,,,,
Melting Slicks
Joined: Aug 2016
Posts: 2,346
Likes: 1,174
From: CLEVELAND STUCK IN OHIO
2024 C3 of the Year Finalist- Modified
So far, all I have adjusted is the target idle RPM, my engine is not a super high performance build, just heads, intake, cam, headers, just a small amount of more horsepower, just for normal driving,
Thread Starter
Racer
Joined: Jul 2017
Posts: 399
Likes: 115
From: chico ca
My 327 is very mild also. Thought this would be simple add on. Just curious did you go with fuel pump outside tank or buy the system in the tank? I can’t explain how loss my fuel pump is when starting the car.
Melting Slicks
Joined: Aug 2016
Posts: 2,346
Likes: 1,174
From: CLEVELAND STUCK IN OHIO
2024 C3 of the Year Finalist- Modified
I built my own in tank system utilizing the factory sending unit to handle my pump and Holly Hydra matte in place,, I didn't want to put any other holes in my tank ,,,, i did post a thread with some pix of what I made,, you might find it,,
Intermediate
Joined: Sep 2014
Posts: 39
Likes: 4
From: Taunton MA
I was having the same hot start issue with my MSD Atomic EFI (installed in a 78). I believe some sort of vapor lock was occurring in the fuel rail as it was super hot to the touch. My fix or at least it's been working was to add a one way check valve to the fuel line (using AN firings) where it meets the fuel rail. Not sure if this is the perfect fix but it worked for me.
Here's a pic:
Here's a pic:
Last edited by GN1978; Jun 13, 2019 at 04:14 PM.
