Fuel Pressure Regulator Not Reading With Engine Off
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Can Fuel Force per unit area Be Set With Engine Off?
- Thread startertsi1991awd
- Outset appointment
- #1
- ane,370
- half-dozen
- Sep 28, 2008
- Puyallup, Washington
Simply can it be set with the motor off and using the fuel pump check by the battery? My base pressure will exist quite low upon first start upward if I ready it with the motor running, since the new AFPR install simply went underway and I'yard but at present getting my chip, etc.
Any thoughts?
- #2
- 76
- 0
- May 25, 2010
- Glendive, Montana
- #iii
- 33
- 0
- Jul 18, 2010
- Mechanicsville, Maryland
- #iv
- iii,590
- 246
- January 13, 2006
- Clarksburg, West_Virginia
- Thread starter
- #five
- #6
- xiv,183
- one,210
- Feb 3, 2002
- Boulder, Colorado
One time the AFPR is set to the right pressure and bold it's able to handle the cars fuel pump it won't brand any divergence how much more voltage the pump receives. 36.3 psi at the regulator is ever 36.iii psi as long as the regulator is working.
- Thread starter
- #7
- #8
- 5,577
- 45
- Nov 13, 2004
- North Bay Area, California
- #9
- one,934
- 6
- Feb 3, 2004
- Chicagoland, Illinois
Just for clarity, is it correct that a 1g enables the fuel pump in key on/acc. position and the 2g will not until you crank information technology?
I call back all turbo DSMs don't unless you lot're cranking.
- #10
- fourteen,183
- ane,210
- Feb 3, 2002
- Bedrock, Colorado
Merely for clarity, is it correct that a 1g enables the fuel pump in key on/acc. position and the 2g will not until you creepo it?
Nope.
I think all turbo DSMs don't unless you're cranking.
Some cars seem to have a glitch coming from their position sensors on ability upward that cause the ECU to think the crankshaft is moving, the ECU to plow the pump on and then time out when information technology doesn't see the pulses standing. From what I can tell reading the lawmaking and the way the MPI relay is designed that the fuel pump shouldn't turn on until yous first cranking the engine. This is the same on both 1G's and 2G'south. The 2G ditched the 2d input from the starter circuit to the MPI/fuel pump relay merely that was somewhat redundant anyway.
- #11
- 55
- 1
- Mar 7, 2009
- New Paltz, New_York
- #12
- 460
- i
- January nineteen, 2008
- Cincinnati, Ohio
- #xiii
- 14,183
- 1,210
- February iii, 2002
- Boulder, Colorado
also theres no vac nowadays. without it running so your FP will seem less
thats why you pull the vacuum line off the regulator dude
If your setting information technology with the engine off there is no vacuum in the intake manifold, it'south at atmospheric force per unit area so the reference port of the FPR sees exactly the same force per unit area as if the hose was disconnected.
In one case you start the car the vacuum at the reference port will lower the fuel pressure simply the base of operations pressure remains the same. The force per unit area difference between the fuel rail and intake manifold is maintained at the base fuel pressure as long every bit the regulator tracks 1:1.
- #fourteen
- 3,590
- 246
- January 13, 2006
- Clarksburg, West_Virginia
I approximate I've not used 1 in such a long time that I've forgotten things.
- #15
- xiv,183
- ane,210
- Feb iii, 2002
- Bedrock, Colorado
The fuel pressure regulator has to exist able to regulate the pressure under total pump flow and max voltage. This is too a requirement.
Every bit long as both requirements are met so there should be no alter in the regulated pressure beyond the full range of organization voltages. And equally long as the FPR functions correctly and tracks the pressure at the reference port the injectors should always deliver the aforementioned flow charge per unit per unit of measurement of time regardless of voltage and manifold pressure.
The typical places where these weather neglect are the stock FPR that tin can't handle the flow of a upgraded pump, pumps that tin't continue up with upgraded injectors, etc.
- #16
- 1,017
- 2
- February 25, 2006
- New Milford, New_Jersey
Yous can usually get it close enough, merely battery voltage does event the fuel pump, so setting information technology while the alternator is in use is better.
I was thinking near this the other mean solar day and this is what I was thinking...
Yes you can set up it past powering the pump from the test connector or using DSMLink if y'all have information technology.Once the AFPR is set to the right pressure and assuming information technology's able to handle the cars fuel pump information technology won't make any difference how much more voltage the pump receives. 36.3 psi at the regulator is always 36.3 psi as long as the regulator is working.
... BUT And so I was thinking this. An AFPR is made to continue fuel pressure at a certain force per unit area NO Affair what the fuel pressure and flow is behind it (unless the pump is flowing so low it tin't go along up, this shouldn't be an issue at base of operations fuel pressure unless the battery was very depression)...
This would be like saying a boost controller is going to be accurate when you are at 4k, only non at 7k. The only time that would exist the case is if there was an issue with the wastegate or if information technology was a smaller turbo and it couldn't go along up with the motor...
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