whats the fuel pressure range for 1990 5.7 tpi?

i have walbro 255 pump and get from 30 -55

 

trying to figure out if its my run ability problem. lmk guys!

 

should be around 46 i believe

 

all data says 40-48

but what would be up with it going all the way up to 55 and low as 31.

 

My rule of thumb with FP:
Key on engine off 36PSI
Engine running @idle 36/40PSI
Wot set 42/48 PSI (lower longer pump life)
Shut off after running..FP should go to Zero in about one hour Estimate.

Anything else in my opinion needs looking at......

 

thanks. when you turn the key on it puts the pressure about 46ish without running

 

Sounds good

 

Without the engine running and just priming the pump 46 PSI key on seems high.

 

thats what i thought. noticed last night its running extremely rich so with that said im ruling out the fuel pump and continuing figuring out whats lacking or going out.

thanks guys with the help!

 

Mine goes to 46 with key on primed and runs about 43-45 at idle
and it does not run rich, block learn is 125-132.