Guess i am looking at the wrong thing.
fuel pressure will not go be low 41psi
- Thread starter turbo1962
- Start date
Eric Stage I
TurboTweak Guy
- Joined
- May 25, 2001
Since your idle vacuum is 16", the pressure should be dropping to about 35psi with vacuum line on (or close to that), if you have the line off pressure set to 43.
Turbo Tweak chip,Deka 60# injectors
I was thinking it should drop more than just one psi.
- Joined
- May 28, 2001
Vac line to regulator actually have 16" on it? Or, is there a misplaced check valve in there, someplace?
Not checked it at the line . just what the boost gauge was showing inside the car,
Does it read 16"hg at the fuel regulator line?
More than once has an internal rust flake started acting as a check valve and ran people ragged.
I will have to check. To cold tonight to check it.Thanks
Set your fuel pressure to 50 psi line off. Reconnect the line and observe the pressure drop. If it still drops 1 psi,you have a restriction in the vacuum line or a bad regulator. If the pressure drops 5-7 psi,you have a restriction in the return line.
Was able to make a test, Hooked a gauge to the regulator vac line i have -15 at regulator. turned pressure up to 50 psi with line off.. Hooked line back up it dropped to 44psi. took line off and lower it to 43psi put line back on and stayed at 43psi. Looks like return line is plugged. Thanks for everyones help.
I will check there first..Thanks
Pulled the line apart in front of tank . Put air to it blowing bubbles in the tank took off regulator and blew air threw it back to tank everything is clear. put it back together. Set pressure at 43 line off line back on dropped one psi. so i gave the regulator about 2-3 more turns out nothing changed. shut the car off the gauge dropped to 20 psi instance. start it back up stays at 42 turn regulator back in 2-3 turns then shut car off it stays at 40 looks like the fuel pump is putting out more than return line can handle??
SCOOBY DOO
BASED CANADIAN PATRIOT!!
- Joined
- Feb 18, 2007
The stock return line can handle a 255 with ease.
Don't be concerned about what the pressure does when you turn the ignition switch to the off position. Disconnect the front flexible return line where it connects to the hard return line at the drivers side of the front of the engine cross member. Place the open end of the flexible line in a bucket and start the engine and see how low you can get the pressure down to.
I have to agree with this.
I’ve put my fuel psi at 50 vac line on and the car was still able to maintain the BLM.
It’s something else
- Joined
- May 25, 2001
FWIW on my car with a 340 in order to get the fuel pressure down when I have to smog it I have to bypass my hotwire kit. With the hotwire it won't drop below ~41 with the line off. Using stock wiring I can adjust it down to the mid 30's for the smog chip. Car has Racetronix 340 and 55# injectors along with new rubber lines and new lines at the motor.
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