[RyanGT]

Joe told me my fuel system is at its limits. Unstable form the beginning and cant be tweaked. My mods in the garage (kb 14 psi, cams, headers, ect). Fuel system currently is 42 lb injectors, vortech 255 (he thinks thats the problem) and bap. The vortech is acting like it was for a return style. He said symptoms match up to other customers he had with same problems, and that vortech was known to do that.

Anyways i have a GT pump i can throw in. What could i do for upgrading the fuel system? Cobra tank dual pump system would be awesome... but low cost would be awesome too Im not going over 500, should be around the ballpark at 475 rwhp but better to aim a bit higher for safty. Was at 453 without the headers and they made a night and day difference with that much boost.

Could i put the GT pump in, do wiring upgrade, and fuel lines? Dont know how or where i would get fuel lines. Dont they get restrictive before the fuel rails? Modify the bucket somehow? Heard of drilling it... Not sure on that though. Modified fpdm?

[RyanGT]

Bump for ideas!

[SWEET2KSTANG]

the gt pump will handle the power easy, no need to worry about needing another pump.the basket mod is a good idea, and should be done next time out. no need to worry about the fuel lines, maybe the rails if you are going to change something.

[RyanGT]

Whats the basket mod? I have also heard that the GT pump and the bap dont work well together. That true?

[dude496]

Never really liked the idea of the basket mod...just seems like a band aid fix that could in the end get you in more trouble than worth.

Basket mod is punching a few holes close to the base of the basket...about 4 holes or so about the size of a penny each

[RyanGT]

What would be the non band aid fix? Im really just wanting a little more fuel to iron out the kinks. Not going to up the boost anymore. Would need new blower. Rear end would be next mods after fuel is figured out.

Im thinking putting the ford gt pump back in (currently svt focus). Doing a wiring upgrade, and the bucket mod? Would that be sufficient? I think the GT pump was starving itself and was putting air into the rails. Which is why the shop put the smaller pump in. The band aid drilling would solve that though, as long as i keep it at quarter tank or a bit lower?

[dude496]

you would not want to ever go below a quarter tank with the basket mod...biggest reason i say that is a bandaid fix. You will suck air into the fuel system if going below quarter tank...not worth the potential problem imo.

So your confusing me big time on this one....they said you are sucking up air and a fix action was putting a smaller pump in??? Not a pro but not sure how a smaller pump would fix such a problem.

Are you pegging lean on the a/f? have a chart of what it is doing?

really thinking you have maxed out what a single svt pump can do...gt pump and wiring will probably be what you need. But then again your pushing 15 psi, you might need to look into a dual pump setup with bigger rails and injectors.

[SWEET2KSTANG]

basket mod is not a band aid, it is a modification to prevent a problem. if that is a "band aid", then the only solution is a baffled tank. if running that much power, you shouldnt run the fuel tank low anyway, baffled or not.

[RyanGT]

Not positive what the reason was, remember it had to do with air getting in the rails because of how the pump was working. They are going to dig up the reason they pulled it.

Current problem now is that the fuel pressure cant stay stable with the current pump. WOT it was pretty much ok. But unstable was the issue. Have 20+ datalogs showing it haha. but no way to upload it on here.

What action do you guys recommend. I already have a gt pump. Wiring mod, with gt pump and fuel rails? possibly basket mod. I thought rails were good till 600 hp?

Trying to get most bang for the buck, im already broke cause of this car! Dont need a huge setup just a 500hp safe one.

[SWEET2KSTANG]

i now saying rails can not support it, just a supporting mod. with the pump, wiring mod, rail, and basket mod, you should be able to hold it just fine.

[RyanGT]

ok cool, ill throw that at the shop. besides rails everything is pretty much free just a little labor. And rails are like 100 bucks compared to a 1.3k cobra tank setup.

So quarter tank is about as low as it can go? Or dont thrash on it right. Will hard corners kill it when its at a quarter? Dont want to scare myself in driving like a granny. Should the holes be front and back, not on sides? So that on a turn gas doesnt dont pour out?

[SWEET2KSTANG]

the holes should be on the bottom, i believe. where did you get your wiring mod??? about to do a gt pump in mine and was wanting to do the same.

[limited]

I run a gt pump with a bap with no problems,run around 70% dc with my mods.(Joe has had no issues tuning my fuel pump)

You HAVE to drill the basket when you run a hose directly from pump to hat(recomended with gt pump install). Have you noticed what that double connector does that is on the pump? It actually bleeds pressure off the pump and fills basket,it also creates a venturi effect pulling fuel in basket thru the sock thats on rear of basket that also fills basket. . so you can see why it is possible to suck basket dry

I drilled two 7/8 holes on bottom and two on the front side. I have gotten on it many times at 1/4 tank(on purpose) and my a/f stayed rock steady. I am not afraid of flooring it with 1/4 tank,no less(no guts lol) but in no means going to recomend it

[RyanGT]

Ok good! Ill give those guys a call in the morning. I think i can squeeze this fuel system a little bit more. Thats all i need. So GT pump will go back in, but with the holes drilled in the bottom of the bucket. And wiring upgrade to help out a bit more. Possibly fuel rails just because it cant hurt to have a little extra fuel there, all it would have to do is keep the pressure up and all would be well.

I dont have a kit for it. I believe its just a bigger gauge wire to the pump to the BAP and bap to the fpdm. Not sure what else, think there is one more wire to upgrade. There's diagrams floating around.

[dude496]

I'm still baffled at why the tune shop would put the smaller pump back in....it's supposed to be a sealed system.

Part of that sealed system is the basket....that is the other reason i say drilling holes is a garbage mod...when it comes to fuel, do it right the first time imo.

Since ya cant post the actual chart...can you just type up the a/f ratios at different rpms?

[RyanGT]

Ya, its a speed shop that did it. Joe is tuning (trick tuners). Its mostly the fuel pressure thats unstable.

Shit actually i cant i dont have excel anymore. So its just a csv file. Bunch of scrambled numbers. Well the pressure was ranging from 35-45. It wont be ironed out he has tried! He would like it at 39-41 psi. Thats why i was getting surging sensations.

I could email you the file if you want to take a look.

[RyanGT]

Joe said my fuel pump is at about .48 duty cycle and starts pegging at .49... and its giving me more issues than it should. He showed me some screen shots too with it pegging, and it is, grr! Said its probably mechanical, crimped hose, leak, or loose wire. It has a huge problem on hills. But not consistent... can be uphill problems and then be fine later on up hills and twitch out going down hill...

[Trick Tuners]

The cobra tank is nice because its baffled.

This is the GT tank

I think you would be fine with a GT pump, bap, and wire upgrade. I think the cobra tank is around $300.

[RyanGT]

Ok and drill the 4 holes in the bottom of the basket? It looks like it is flush on the bottom though? Last time i had the gt pump it starved itself.

[RyanGT]

Haha so looks like my frps is bad. Its capping out at 50 psi when they hooked their comp to the ecu. But his mechanical gauge was reading 100psi. And the computer wanted more and said unable to reach desired pressure. So i might not even need to do half this stuff!