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blue68deville
02-14-2014, 08:50 AM
Wondering if folks see a difference using the hot fuel handling module. All I found with the forum search was that it runs the fuel pump for a period of time after shut down to help with hot starts on the hd trucks.
Is it helpful?
EagleMark
02-14-2014, 08:54 AM
No... all it was for was to run fuel pump 20 seconds after shutdown to cool the TBI unit.
billygraves
02-15-2014, 11:27 AM
..............
Nasty-Z
02-15-2014, 04:46 PM
The Mark 5 Big Block 7.4L TBI increased the fuel pressure in the later years(93 94 95) to help with this problem.

Only 94-95 TBI Big blocks ran the elevated fuel pressure , '93 was the lower pressure .

That's some interesting reading on the other ways GM addressed underhood temps though.

TOM
blue68deville
02-15-2014, 06:50 PM
Don't know how my hot starts will be yet, I'm installing everything now. I've got a 93 454 TBI and have repinned the harness to the 7747 ECU since I don't need the trans control.
It's easy for me to put in the hot fuel module now, so I'm going to run it since I have it. The Caddy 472/500 motors are pretty warm runners anyway so it can't hurt.
The Q-jet would be pretty unhappy on hot starts, particularly at altitude. No surprise there...