Fuel Pressure Reading

[Drifter27_04]

OK short and simple my fuel pressure starts to drop slowly after turning off the car. A friends fuel pressure can hold pressure through out the night.

Which of the two are correct to do and why/what would cause which ever one is wrong?

Thanks you all.

 

[romeen]

According to Aeromotive (your profile shows you have one), it is normal for their units to allow the pressure to bleed off. Mine was doing the same thing so I contacted Aeromotive and that is what they told me. They said something in the design that was incorporated to make them more accurate allowed this to happen.

Some members have posted saying their Aeromotive units do not bleed off. I couldn't tell you why that is.

Does your friend also have an Aeromotive AFPR?

 

[Drifter27_04]

According to Aeromotive (your profile shows you have one), it is normal for their units to allow the pressure to bleed off. Mine was doing the same thing so I contacted Aeromotive and that is what they told me. They said something in the design that was incorporated to make them more accurate allowed this to happen.

Some members have posted saying their Aeromotive units do not bleed off. I couldn't tell you why that is.

Does your friend also have an Aeromotive AFPR?

Oh ok I was just thinking that I may have a injector leaking or something or somewhere in the system.

No he bought a Fuel Lab FPR.

 

[snowborder714]

My Aeromotive does the same thing. I'd say within 4-6 hours it's down to 0 pressure. I rewired my cruise control switch to activate the fuel pump with the key in (either ACC or ON) so that I can start the car with full fuel pressure.

 

[kahl23]

Why not just use DSMLink to have the fuel pump turn on with the key in the "on" position? Leave it there for about 2 seconds, let the fuel pressure build, then start.

 

[snowborder714]

I personally didn't do that because I don't always drive around with a laptop in the car. This way I can check my fuel pressure as well as get fuel to the system at any time.

 

[kahl23]

You don't need a laptop, as long as you set it and don't lose power to the ECU it will maintain your settings. We have a gauge on the FPR, so if I ever feel the need to check the pressure I just twist the key, walk to the front and check the pressure. The only downside is that it will run down your battery very fast if you forget about it and leave the key in the ignition in the second position. Ask me and my dead optima how we know.

 

[snowborder714]

True, but I have the key in the ON position a good bit, and I would rather not have fuel pump on ALL the time.

 

[snowborder714]

Here's what I did with the cruise control switch, if anyone's interested or confused:
http://www.dsmtuners.com/forums/bol...mp-switch-wiring-questions.html#post151327477

ALSO: If you read that link, make sure you read post #30 by luv2rallye as it contains important information. Or just go ahead and read the whole thread - it won't take long.