The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners

  • Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

Please Support Rix Racing
Please Support STM Tuned

High oil and fuel pressure after start up

1Gina2G

Proven Member
811
2
May 6, 2011
Beaufort, South_Carolina
Alright so first I checked if any gas was coming out of the vaccum line on the stock regulator, nothing was wet there so I assumed that part was okay.

I removed the old return line and temporarily hoseclamped a -6an hose to the stock regulator, other end ran into a gas can. Fuel is deffinatley making it through the regulator with no leaks but adding the large hose only made the fuel pressure drop around 65psi or so.

I still didn't let the engine get fully warm mostly because of the really high fuel pressure. But this time I was suprised to have the oil pressure guage fully maxed out WTF

I did 2 small start ups, the first one the oil pressure was at 100psi, maxed out, and the fuel pressure was just below 70psi, roughly 67. Which was about 10psi or so lower than with the other return line.

the second time the fuel pressure was closer to 64 65 psi but with the oil pressure in the high 80s again.

I know the oils supposed to be high pressure on a cold start but should it ever be around 100? I'm sure it'd go under 80 once warmed up but still...and I guess since a -6an line is overkill for a return line, that I deffinatley must have the walboro 255? I wish I took pictures of the pump. Too much hastle with the fuel hanger to open it up just for that though, but it looks like I really need to get an adjustable regulator right?

If it matters, my wideband is saying the air fuel ratios in 14's area, seems ideal.
 

1Gina2G

Proven Member
811
2
May 6, 2011
Beaufort, South_Carolina
I figured out the problem, the electric gauge went bad. After reading alot it doesn't seem like an uncommon problem at all, you just always want to belive somethings %100 because it's brand new..but you never know.. :(

It was reading around 15-25 psi with an empty fuel rail LOL
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com OHM Racing Raven Fabrication RixRacing RockAuto RTM Racing SouthBay Fuel Injectors STM Tuned VR Speed Factory

Latest posts

Build Thread Updates

Latest Classifieds

Top