$8D fuel pressure variation
01-15-2017, 08:36 PM
#1
Junior Member
Thread Starter
Join Date: Nov 2007
Posts: 69
Likes: 0
Received 0 Likes
on
0 Posts
Car: 5500lb Brick
Engine: Gen 1 SBC 383 Hyd Roller cam
Transmission: TH 400
Axle/Gears: 4.10 35in tires
$8D fuel pressure variation
Is it normal to have a lower fuel pressure at hot idle vs cold idle?
The fuel pressure gauge reads about 3lbs lower after a logging session.
What things should I check if not normal?
Walbro 255LPH Aeromotive AFPR P/N13109.
Thanks!
The fuel pressure gauge reads about 3lbs lower after a logging session.
What things should I check if not normal?
Walbro 255LPH Aeromotive AFPR P/N13109.
Thanks!
01-16-2017, 11:13 AM
#2
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,401
Likes: 0
Received 215 Likes
on
201 Posts
Car: check
Engine: check
Transmission: check
Re: $8D fuel pressure variation
If the gauge is liquid filled that will do it. As the gauge heats up the liquid expands and puts additional pressure on the Bourdon tube.
An aluminum FPR can expand from the heat and change the fuel pressure. I generally do the final fuel pressure setting on a warm engine.
RBob.
An aluminum FPR can expand from the heat and change the fuel pressure. I generally do the final fuel pressure setting on a warm engine.
RBob.
01-16-2017, 03:26 PM
#3
Junior Member
Thread Starter
Join Date: Nov 2007
Posts: 69
Likes: 0
Received 0 Likes
on
0 Posts
Car: 5500lb Brick
Engine: Gen 1 SBC 383 Hyd Roller cam
Transmission: TH 400
Axle/Gears: 4.10 35in tires
Re: $8D fuel pressure variation
Thanks RBob!
All the more reason to have as accurate a tune as possible.
I suspect electronic FPR with voltage compensation tables in the future?
All the more reason to have as accurate a tune as possible.
I suspect electronic FPR with voltage compensation tables in the future?