Fuel pressure issue
Thread Starter
Teching In
Joined: Jun 2025
Posts: 7
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Fuel pressure issue Hello all! currently have an 04 mustang gt with a 6.0 swap ls3 top end. Car has stock tank still with the 340 lph deutshworks pump so it should have plenty of fuel going. It primes up to 26psi 32 sometimes starts then stalls. It goes down to 17 and never builds back up. Any ideas? Fuel pump power remains while cranking and good ground
Thread Starter
Teching In
Joined: Jun 2025
Posts: 7
Likes: 0
So it will run but stalls out and pressure drops quickly. Stalls and starts back up but pressure keeps dropping ie. From 32 to 17, 17 to 9, 9 to 2 then eventually 0. Car does not have a fuel pressure regulator could that be my problem here?
TECH Regular
Joined: Dec 2022
Posts: 444
Likes: 158
How are you controlling the driver module?
Using 2 jumpers at the driver module connector you can give the pump battery voltage and see what the pump is capable of producing. If its still low then your pump failed. If it makes all the pressure its the driver module/control
Thats how I test all those that come through my shop with pressure issues
Using 2 jumpers at the driver module connector you can give the pump battery voltage and see what the pump is capable of producing. If its still low then your pump failed. If it makes all the pressure its the driver module/control
Thats how I test all those that come through my shop with pressure issues
