Since installing the Racetronix 340 pump and hotwire kit, the pressure is too high (68lbs) for the stock regulator and I was told by my tuner to try and get it where it should be. I almost bought a c5 vette setup but heard some people say it didn't work either? I don't want/can't afford a exotic setup so I was searching for maybe a rail mounted setup that uses the stock lines? Anyone have any suggestions? Or is there a aftermarket reg that replaces my stock one that will work? Thanks in advance.

 

Install a fuel pressure regulator on the fuel rail and from the regulator add a return line back to the fuel tank and your done. BTW I'm running a Walbro 450 with the C5 filter/regulator setup similar to the WS6Store's and my pressure is around 65 and so far so good.

 

Gonna look into that, as far as running a return line, how would I plumb that into the tank? What kind of rail mounted regulator do you recommend? Any in particular? I wasn't worried about the pressure but was told that it's too high and I have read of pump failure because of this?

Are you talking about something like this? https://www.texas-speed.com/p-5758-h...ator-8-an.aspx

 

I haven't went that direction yet as I'm still running the C5 fuel filter/regulator. When I do upgrade the fuel system I will most likely go with 8AN fuel and 6AN return and the return line just goes back into the tank via the fuel pump assembly. Right now everything is set up with the factory quick disconnects which has been working so far. Check out the kit from the WS6Store. This kit wasn't around when I did the mod and I did away with the return block but they have designed theirs to retain it. Also I will be using an Aeromotive FPR when I do the upgrade.

 

Is it holding at that pressure pretty steady? Or is over running the regulater? Regulater could be bad.

But if its maintaining at tht pressure the tune can be tweaked a lil to make it work at 65psi. Alot of turbo are tuned with higher or less fuel psi.

 

It's holding steady at 68lbs. Was fine before the change so I 'm pretty sure the regulator is ok.

 

I thought that would be the tuners job actually. You even told him the pressure. lol. It should run better with more atomization now. That should be a 5 minute fix for him. It might go back to the pressure it was if you just use the stock wiring instead of the hot wire kit If you want to go backwards.....

 

So you don't think this would cause premature failure of the pump? If not I'll talk to my tuner and just leave it as is and he can adjust it accordingly.

I'm trying to find where I read that this could cause the pump to fail....I'd much rather just leave it as is. I'm on a very tight budget as it is and I still need a wideband and will probably need a new diff eventually.

 

Tuners do tuning related to the ecu, the last thing they want to be doing is fixing mechanical like fuel pressure issues, that's the customer's job or a customer's designated mechanic.

 

It may simply be the new pump slightly overpowering the regulator as I've seen another setup where the customer installed a smaller pump than yours (255 walbro) in an 01 Trans Am and was at 62 psi. He replaced all his lines and tried a different gauge, same story. So in your case with the 340 lph pump, perhaps the 6 psi higher than the 01 T/A customer's 62 psi fuel pressure, isn't too far out.

As far as the c5 regulator/filter, I've been looking into this in depth and even on those, much bigger than a 255 lph pump combined with a stock return line results in higher fuel pressure than the regulator's 58 psi preset. Some that have used a 340 lph report being in the 70s for fuel pressure. Too much pressure does put excess load on the pump for sure and will overwork it but high 70s/low 80s psi of fuel pressure would probably be where the issues happen.

Your 68 psi shouldn't be too crazy and should be alright on the pump. Seeing your fuel pressure at full throttle in high load would be interesting to see if it is still 68 psi.

 

Well, I'm trying to get by as cheap/painless as possible so I might try the WS6store's c5 kit. I emailed them about it and was told it would work and bring my pressure down to between 55-62lbs. I'd hate to make the wrong decision about it but can't afford a expensive setup