Fuel pressure decrease wot

[BioMechanic]

Installed analog fuel pressure gauge. 50 psi idle. Uopn throttle decreases to 20psi. Cleaned fpr screen now idles at 40 psi, throttle 15-20psi. Need help. Need fuel pressure.

 

[79jasper]

If you have the money to do so, go efuel.
Otherwise you could have a weak fpr spring. You could try the bb mod.

Sent from my SAMSUNG-SM-G935A using Tapatalk

 

[BioMechanic]

okay, just installed BB mod. now 60psi at idle and does not drop below 40psi WOT.

i guess my question is should PSI drop WOT? i would assume it would increase with throttle. more RPMs = more cam rotations = more fuel from mechanical fuel pump... right?

 

[DaveBen]

Not really. You have maximum flow at WOT and that will cause the pressure to drop. Fuel pressure may come up a bit as RPMs increase.

 

[Artpro]

okay, just installed BB mod. now 60psi at idle and does not drop below 40psi WOT.

i guess my question is should PSI drop WOT? i would assume it would increase with throttle. more RPMs = more cam rotations = more fuel from mechanical fuel pump... right?

Newby here. Pray tell, what is the BB mod??

 

[Mick]

Newby here. Pray tell, what is the BB mod??

You put a BB behind the Fuel Pressure Regulator spring to increase the pressure.

 

[DaveBen]

40 psi at WOT sounds about right. These engines do not make more pressure at higher RPMs. Faster fuel flows = more resistance and less pressure.

By the way, Artpro!