Car dies after about 30 minutes, won't start until cooled.

TCBigDog

New Member
Aug 2, 2013
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I have a 1970 Mustang with a 347 running a Holley Sniper EFI.
Car runs great for about half an hour then dies. Doesn't sputter or run rough, just dies without warning. After that, when I try to restart, I get nothing. Engine doesn't turn over, I don't hear the solenoid clicking.
I have good voltage and I can hear the fuel pump running. After sitting for 20-30 minutes it will start right up like there was never a problem.
The EFI was installed last fall, this problem started this spring. Also have a new starter.
Any ideas what could be causing this issue?
 
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7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
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I read the title and expected vapor lock for this year of Mustang.
So brainstorming -
Second thoughts are the PIP and ignition module with a later 5.0. What distributor and ignition are you running with the Sniper. Those problems would still allow the engine to turn over.
Heat soak could explain the starter.