Fuel pressure decrease wot

BioMechanic

SDD Junior Member
Joined
May 29, 2007
Messages
2
Reaction score
0
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

Full Access Member
Joined
Aug 9, 2015
Messages
228
Reaction score
24
Location
El Paso, TX
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

SDD Junior Member
Joined
May 29, 2007
Messages
2
Reaction score
0
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

SDD Senior Member
Joined
May 31, 2005
Messages
9,621
Reaction score
81
Location
Ukiah, California
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

SDD Junior Member
Joined
Jun 9, 2015
Messages
1
Reaction score
0
Location
Salem, OR.
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??
 

DaveBen

SDD Senior Member
Joined
May 31, 2005
Messages
9,621
Reaction score
81
Location
Ukiah, California
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, :welcome Artpro!
 

Members online

No members online now.

Forum statistics

Threads
30,506
Messages
266,042
Members
14,618
Latest member
Kastn4
Top