should have put it here....

I have a 383 with a Procharger. Making about 600hp but running out of gas with a Racetronix and BAP.

I was briefly told that I could mod the existing fuel filter?? or use 97-98 parts to do something to help (but didn't get all the specifics at the time)

Can anyone expain the filter mod?

 

you can change your fuel system to a return style like on the 97-98...99 and up have a return-less style. I have not heard of the filter mod though

 

Your current filter has the return line in it but it is waaay in the back. The 97-98 style setup has the return line up at the rail. The filter mod I assume is replacing the later style filter with the 97-98 one and upgrading the lines to the older (better) setup.

 

http://forums.corvetteforum.com/c5-f...sion-info.html

 

Picture links were dead.

 

 

Yea the thread is six years old. But it is exactly what the OP wants to do so I figured it was some help. From what I understand GM no longer makes those parts so unless you buy used it is practically impossible to do. I wish I could provide personal pics but I went with the A&A fuel system in my car and that has worked very well for me.

 

If your only making 600rwhp on boost with a racetronix intank kit, and running out of fuel, I think you have a problem somewhere else. Maybe your filter IS clogged or something. I say that cause we've made 787rwhp on racetronix. We were MAXXXED out at about 5500rpms with 60's, racetronix intank, and hotwire kit on a 00 C5. No BAP. We probably could have been safe at a maximum of 700rwhp-720rwhp and about 6400rpms.

So,... I think you have a problem somewhere. Possibly clogged filter? Is the pump done?

 

Filter has been overlooked. Going to change that out on your recommendation. I was under the impression that the racetronix pump and KB BAP was only good for about 650 hp. If I can get 650-675 with what I have - I'll be satisfied.

I was told that I need to change the fuel rails too since the 60's are sucking the stock ones dry so that's next on the list.

 

Filters play a big part in delivery. I work as a tech at a dealership,....you wouldn't believe some of the stuff that comes out of these things. It's cheap enough to replace every few thousand miles.

I did leave out that I run FAST fuel rails with that setup. Good idea that you have to replace them with larger units. Any brand would work of your choice.

After that, you SHOULD be good to go, as long as your pump is still golden. I think racetronix rated those pumps to 700 something,... I think they were dead on from my experience. With a BAP, i'd probably think you could net some more but, I honestly do like relying on BAPS as I have seen several fail through the years here with some cars,... although I have seen SOME last years as well.

Hope the filter fixes the problem man. May want to put a gauge on the rail and go and test the pump out. YOu can always test fuel pump volume by installing a mechanical fuel gaue(for testing-not like an autometer or something).... one with a pressure relief button,..... start the car.... then, with a drain bucket(waterbottle-long hose, whatever), while the vehicle is running, you can press the pressure relief button, and see if the car dies,....stumble,..etc. If it does stall,.... you have a GOOD PRESSURE but NOT enough volume. Meaning an obstruction(clogged filter), and or a bad pump.

Again.... hope it's a simple filter issue.


*on 42lbers,fast rails, racetronix kit, hotwire, procharger, the same pump easily supported 615rwhp with no issues as well. So again, I think the number your looking for, your setup should work without issues.

 

the stock rails will support a lot of HP, so I would hold off on changing those. mine support 750 rwhp with 60s

your cheapest route is to change to a 97-98 fuel filter, add a regulator to your rails and install a return line. Check with A& A or ECS, I bet one of them can sell you a kit to do just this.

 

I did this exact think when I finished my TT build. Its very simple and will give you some instructions, possibly pics if I can find them.

You will notice 2 plastic lines going into your current fuel filter. One being the main feed line and the other returning to the tank. Simply take the current filter off, mount the older style fuel filter and attach the main feed line to the filter. Disconnect the factor return line from the fuel hat as this is where I connected my return line from the regulator at the rails. I simply left the short factory line in place as it is sandwhiched between the frame rails and the body, so its not hurting anything. I am also still using stock LS2 fuel rails.



You can see here where the return barb is placed, however, I have since switched to an AN style fitting to avoid kinks, etc..

 

Are the return lines anything special? Braided? Regular good quality fuel hose? Wouldn't think a return line would be under too much pressure.....

 

I got mine from Jegs. Its braided nylon so nothing to special.

 

I was relying heavily on meth and my 60lb injectors opening all the way up with fuel pressure down in the 40's to make about 680rwhp. I found a used set of 97 fuel rails, installed a 97 filter, and made my own lines. The difference was HUGE. With no other changes AFR was in the single digits. I had to take out a ton of fuel while re-tuning.

 

Is that the return line coming off the front of the rail?

 

That looks like manual FP gauge on the front, the return is the second line coming off of the rail next to the feed.

I vote for the 97/8 setup, you will always be looking over your shoulder running the regulator at the filter - just too easy to starve the engine for fuel.

As for hoping the filter will solve your problem - i wouldnt put too much faith on that - i used to change mine out every 6 months or so - and at ~80 a pop, that adds up. (i daily drove the car, so every 6k or so)

I had issues supporting ~500hp with just an intank pump and hotwire kit. Wasnt until i switch to the 97/8 that all my fuel issues went away.

Good luck.

 

Interesting how you guys have trouble at 500rwhp, and I didn't see trouble till 200+more rwhp then that. Odd,....wouldn't you think? (00 FRC)

I've since gone to a magnafuel xl750 -10 feed, -8 return, custom hat, 160lbers, and a magnafuel regulator.

 

(at the time) seemed a bit hit or miss with pump issues. I also have an 00 frc - and had a few folks boggled over it (my tuner, fuel pump supplier, other fuel pump supplier). But i am certainly not the only one out there.

There are folks out there pushing big power through the 97/8 system. I dont think it is a waste by any means - and is very reasonable compared to a full fledged racing fuel system.

 

Not disagreein' hommie. For the price, I agree.