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

TCBigDog

New Member
Aug 2, 2013
3
0
2
Colorado
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
6,862
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Kearney, NE
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.
 

2Blue2

will be trying this sex one when I can find it
Mod Dude
Mar 5, 2019
3,469
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Oahu
hot oil film killing starter grounding?
Just guessing,need more info
 

CAMTWO1070

Active Member
Dec 17, 2021
64
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52
NY
Do you have the Sniper setup controlling the timing or non-control...?

What distributor are you using?