Fuel Pressure Problem, Need Help Please Options

[Lil-Joe101]

So I received a phone call from the shop that has been helping me with the rest of the swap. For some odd reason the car idels normal when both my electronic fuel pressure gauge and their fuel pressure gauge measured directly off the fuel filter reads "0". As the fuel pressure climbs to normal operating pressure the car begins to idle rough, almost to the point of dieing. Both gauges have the exact same reading simultaneously so I know our gauges are reading properly. Im stumped because if both gauges read "0" the senerio should be reversed. Also the pressure isnt staying steady. It raises, drops and raises and drops. As I said as it drops idle is better as it raises it worsens. Both the shop and I believe it to be a bad fuel pump. Need a second opinion on this matter. Has this happened to anyone else during there swap or at all. What could be the reason behind this. NEED HELP ASAP.

[Malek]

Sorry I'm not up to date with your swap. Are you using the Fuel Pump Relay box with your swap or did you bypass it running constant high pressure?

This almost sounds like an ecu type issue. I don't think voltage at the pump changes as the car warms up.

Or..faulty fuel pressure regulator? Which regulator are you using? The pressure might build because the regulator is restricting it too much and is not allowing sufficient flow to the injectors, starving it. 0 psi could be a relative measurement meaning that it is reading whatever pressure it is at idle as 0 and builds from there.

Plot twist: This may very well not be a fuel delivery issue as much as a mixture issue. Don't get tunnel vision and focus on one thing (gauges) that doesn't seem right.

Just throwin out ideas. Good luck to you man.

Edit: I've had my fair share of fueling issues ranging from pump voltage to clogged filter to fuel pick up...more often than not (basically every damn time), the thing I believe is causing the trouble turns out to be perfectly fine and I end up fixing more things that don't need to be fixed.

This post has been edited by Malek: Feb 11, 2014 - 10:44 PM