Engine/Transmission (1994 - 1998) 12V LP Pressure prssure

[Texas Diesel]

What pressure gauge range in needed for the 12V LP? I want to make sure my (prospective) pressure tested will work on 24V and 12V LP's both.



TIA

 

[Fred Swanson]

30 psi should work for testing it.

 

[Greenleaf]

I installed a 16 psi gauge onto one engine and it didn't surpass that. Then, days later I tested another with a 30 psi and it didn't surpass that. Later, I tested another and it was like 18psi on a 30 # gauge. I changed out the overflow valve and installed a new lift pump. It was 28 psi and I could bury the guage at part throttle. I tested with a 60 # unit and it showed bout 34-35 psi at WOT.



I now use a 60 # gauge if the 30 won't cut it.

 

[Vaughn MacKenzie]

Yes a 60psi gauge is a better choice than a 30 for a 12v.

 

[Joe G.]

I use a 40 PSI gauge. In some conditions it will peg it.

 

[Texas Diesel]

Thanks for the responses!!

 

[Greenleaf]

I have seen 49 psi when I became a little carried away with shiming the relief valve spring. It seems to be sensitive. Adding two shims seemed like it added 20 psi.