Hey yall,

Sorry if this has been asked before but I can’t get a clear answer and want to be 100% sure before I drop a few hundreds.

I need a new fuel pump for the Stillen supercharger FMU, the secondary one. I think it’s starting to fail + it’s super rusted and corroded on the outside, it just looks absolutely cooked.

From what I’ve researched, it was a Vortech Trex fuel pump… But the only ones with the Trex name on Vortech’s site are for 80s-90s Mustangs. I don’t think those are the right ones.

And then I found this one on Vortech’s site. It looks more accurate to the one on the kit currently. Just wanna double check though: https://vortechsuperchargers.com/products/155lph-inline-fuel-pump-w-ftg

Is this fine to use as a replacement? If not, are there any other options for the secondary fuel pump? I’m already aware I can use a Walbro 255lph in the tank, but I would prefer to have a complete kit so I would prefer to keep the secondary pump if possible. But I’m open to whatever options are available.

Thanks!

 

Ok quick update and one question

I was talked into just getting the Walbro 255lph. The acceleration surge issue is getting worse and more consistent. I think it’s time for a new pump asap

I did the reading about installing the Walbro 255lph for the Stillen S/C. Seems simple enough. My only question - did anyone require an adjustable FPR for this? I saw a forum post that said you have to get an AFPR and set it to 34psi for the stock idle. But it was literally just that one post, I haven’t seen anyone else mention this anywhere.

Thanks!

 

Sounds like you have the original setup with the Vortech FMU, pressure switch, relay and auxiliary fuel pump.

I'd give Vortech a call as their customer support is pretty good.

 

Also, have you read through the stickies in the Supercharger Forum? Lots of good info in there regarding fuel pumps/fuel management.

 

You have a wide band air fuel ratio gauge, right?. That will tell you if need an adjustable fuel pressure regulator.

 

Yessir I’ve got the AFR gauge on my dash. I did some more reading through the forums and I think I’ve got the info I need. I’m gonna install the walbro this weekend, reroute the fuel lines up front, and hopefully she’ll start driving smooth again

 

What kind of acceleration surge are you getting? Part throttle or full throttle? I ask because I had surging during partial throttle and it was due to my bypass valve.

 

It happens during partial and full throttle. I’ll also sometimes see the AFR gauge bounce around when the surging happens. This is good info to have though, if the pump doesn’t fix my issues I’ll consider the bypass valve