All the sudden running lean - please help

[SnakeBoostE85]

I haven't driven the car in a long time and seemed fine, also put fresh fuel in... However in doing a WOT pull, fuel pressure is steady at 55+psi and the higher the boost gets the leaner I go. I know I need to replace my fuel filter, but I am thinking injectors.

Thoughts?

 

[13COBRA]

You're on the right track. I'd switch the fuel filter out, fulling expecting to need injectors as well.

If that's not it, I would check the flow on the fuel pump.

 

[SnakeBoostE85]

I think I'm just going to pull the injectors, tank, pump, filter. New filter, pumps, and get the injectors serviced. Its been 8-9 years at this point. This is an E85 car, so probably time to clean it all out anyway.

 

[MG0h3]

Are you on a return style system?

If so, pressure should be boost referenced and increase due to the regulator.

What’s your base pressure key on engine off, or full vacuum @idle?

What boost are you supposed to make/seeing on gauge.


Sent from my iPhone using svtperformance.com

 

[SnakeBoostE85]

yes - return style... base pressure is about 39 psi, idle or key on. Pressure rises perfectly with boost with the boost reference going to the regulator. At WOT, in boost it immediately goes to 55-60 psi... all seems good there.

Honestly I think I let it sit too long and its all gummed up... just gonna have to take it all apart. Service injectors, clean everything and possibly replace the pump and filter... I'd feel better just putting a new pump in. I overheated a few times before I installed a fuel cooler. Which is a whole other topic of discussion with these return fuel systems.

 

[me32]

What pumps are you running?

 

[SnakeBoostE85]

I don’t remember what I put in, it’s been like 9 years.

 

[SnakeBoostE85]

One of the fuel pumps was dead - dual 340's. Two new pumps, serviced injectors - running great again.