Setting Fuel Pressure On Return System
06-28-2013, 02:24 PM
#1
Setting Fuel Pressure On Return System I have setup my car with a return system. I have a regulator coming off the stock fuel rails then from the regulator back into a return line to the tank.
The regulator I'm using is an old one i had from a previous car (don't know what make or model it is). It is boost reference, and I remember on that car I would remove the vacuum/boost line and adjust the fuel pressure, then hook the line back up and be good to go.
the problem I'm having is it seems like i will pull the line of and set the pressure. Then next time I start the car I noticed it is running lean and will look at the fuel pressure gauge and it is at a lower psi.
Is it a bad regulator causing this? Am i adjusting it correctly by pulling the vacum line off to set the pressure? I removed all the guts out of the stock fuel rails fuel stabilizer (silver thing on the entrance of the fuel rails), could this be causing the issue?
The regulator I'm using is an old one i had from a previous car (don't know what make or model it is). It is boost reference, and I remember on that car I would remove the vacuum/boost line and adjust the fuel pressure, then hook the line back up and be good to go.
the problem I'm having is it seems like i will pull the line of and set the pressure. Then next time I start the car I noticed it is running lean and will look at the fuel pressure gauge and it is at a lower psi.
Is it a bad regulator causing this? Am i adjusting it correctly by pulling the vacum line off to set the pressure? I removed all the guts out of the stock fuel rails fuel stabilizer (silver thing on the entrance of the fuel rails), could this be causing the issue?
06-28-2013, 05:45 PM
#3
Actually you can reference any vehicle, but the tune has to match.
Your car is currently set up for a fixed pressure so if you boost reference & therefore add vacuum at part throttle it will pull fuel pressure, leaning the mixture.
Unless you are boosted & need the added pressure, leave the line off.
Otherwise correct your injector flow tables to match the boost reference connection.
Your car is currently set up for a fixed pressure so if you boost reference & therefore add vacuum at part throttle it will pull fuel pressure, leaning the mixture.
Unless you are boosted & need the added pressure, leave the line off.
Otherwise correct your injector flow tables to match the boost reference connection.
07-01-2013, 06:05 PM
#4
I have a turbo kit and am just starting to tune it, wanted to make sure i had everything setup correctly.
the injectors are 1000cc injectors at 43.5psi, so to keep it simple I was going to set fuel pressure to 43.5 psi. Then in the fuel injector table I entered all the same entries all the way across it as the regulator should raise pressure with boost, correct?
If I'm not mistaken then i pull the line off the regulator and set the pressue to 43.5psi, and hook the vacuum/boost line back up. At idle the fuel pressure will be lower but then under boost it should add pressure, correct?
the injectors are 1000cc injectors at 43.5psi, so to keep it simple I was going to set fuel pressure to 43.5 psi. Then in the fuel injector table I entered all the same entries all the way across it as the regulator should raise pressure with boost, correct?
If I'm not mistaken then i pull the line off the regulator and set the pressue to 43.5psi, and hook the vacuum/boost line back up. At idle the fuel pressure will be lower but then under boost it should add pressure, correct?
Last edited by gpr; 07-01-2013 at 06:17 PM.
