The pump seal split by it self after the install. See picture in link.

https://www.evolutionm.net/forums/ev...e-problem.html

1. What seals do other 400l pump user use?
2. where can you buy just that seal?

 

Stm sells just the seal.. I have had to replace mine a few times... My fix was to cut the filter housing off the pump hanger and run a hose barb fitting like a double pumper would

 

I wonder if this is why i'm leaning out out high boost? I just drilled the siphon and upgraded the return line yesterday hoping it would solve my problem. It lowered my base fuel pressure but the car is still leaning out at WOT.

 

Please expand on Stm.... full name and contact please.

 

http://www.streettunedmotorsports.com/

STM Tuned Inc.
5625 Bruckel Drive
Avon, NY 14414

Phone: (585) 226 8226
Fax: (585) 226 8223
Email: sales@streettunedmotorsports.com

 

Thanks!

 

This the GAS Walbro 400? I'm looking into doing the E85 version and want to make sure it fits...

 

I have the e85 walboro 455lph and it fits the hangar. I'm still having fueling issues though. Gonna try a couple more things tomorrow

 

the walbro 400/416 have larger diameter nozzles and thicker barbs, so i can see how it could happen. my bet is that you shoved the seal over the barbs on the pump outlet whereas i cut off all but a tiny bit of the barb on my walbro 416. i ran a walbro 400 for about a year with no problem, and i have several months now on a walbro 416 with no problem.

 

I am also running the E85 version (416) setup like a double pumper and it is awesome