Supercharger and fuel system

S

spederman

Member
Apr 13, 2005
732
0
16
#1
I'm new to the supercharger world. I have a Vortech SQ tuner kit, so i am piecing together the rest of what i need. So i have been doing research on the fuel system and know that i need 42lb injectors. I was doing some research on the fuel pump thing and am really confused. I thought it would be as simple as a new fuel pump and being done with it.

Now i hear that ideally i would need a 03/04 cobra tank and high flow pumps. WTF??? The more i mod my car, the more i wish i would have held out for a 03/04 Cobra instead of buying the first thing i saw. It seems like Ford set out to make a sports car and it was never intended that anybody could possible want more than 260HP. Everything in the GT has to be upgraded to where the cobra is in great shape. I know that it costs more, but you would think that something on the GT would be able to stay stock. OK rant off...

Back to fuel pumps. So i plan on pushing 400rwhp. There are a ton of people on here running superchargers. What did you all do for the fuel pump? I really dont like the idea that if i dont have at least 1/2 a tank of gas, that i might blow the engine. Whats the best way to go with this? Is there anything else in the fuel system that has to be upgraded besides fuel pump and injectors?
 
#2
I have your answer....

Tomorrow, call Liberty Ford @ # 410-655-2000 & ask for ext 5618. Then ask for "Randy" . Tell him you need a Ford GT fuel pump. Its $90 shipped (well to TX anyways...mine just shipped today) and will support OVER 500RWHP AND will fit in your stock GT basket. Just pull the electric pump out of your basket....drill some 5/8s holes about 1/2 way up all the way around the basket...kinda up and down (doesnt have to be a straight line) and drill a few (or bore the 2 up there out) in the top. Clean it all out and drop the GT pump in.

I was in your situation and bought an SVT focus pump for $100....and found it it maxes out @ 400ish RWHP. :nonono: . So I did a TON of research and found this out.

The holes are so that the pump doesnt drain the fuel basket it sets in....one guy drilled only 2, 1/2 holes and it started going lean @ I would estimate 440RWHP. (10 PSI on 01 cobra)
Another guy maxed the pump out @ 575RWHP and 60# injectors (drilled ALOT of holes apparently). Sorry if im jumping around...have to go to the gym and am in sortof a hurry. :nice:


EDIT its a HECK of alot better than $849 for new cobra fuel pumps and its tank. Just keep yours above preferrably 1/2 tank and you will be fine. You can run down to a 1/4, but if you corner hard, it may suck air and you will loose fuel pressure. Its Ok if your not in boost though...just get a fuel pressure gauge and see where your safe at.
 
#4
hotmustang331 said:
I have your answer....

Tomorrow, call Liberty Ford @ # 410-655-2000 & ask for ext 5618. Then ask for "Randy" . Tell him you need a Ford GT fuel pump. Its $90 shipped (well to TX anyways...mine just shipped today) and will support OVER 500RWHP AND will fit in your stock GT basket. Just pull the electric pump out of your basket....drill some 5/8s holes about 1/2 way up all the way around the basket...kinda up and down (doesnt have to be a straight line) and drill a few (or bore the 2 up there out) in the top. Clean it all out and drop the GT pump in.

I was in your situation and bought an SVT focus pump for $100....and found it it maxes out @ 400ish RWHP. :nonono: . So I did a TON of research and found this out.

The holes are so that the pump doesnt drain the fuel basket it sets in....one guy drilled only 2, 1/2 holes and it started going lean @ I would estimate 440RWHP. (10 PSI on 01 cobra)
Another guy maxed the pump out @ 575RWHP and 60# injectors (drilled ALOT of holes apparently). Sorry if im jumping around...have to go to the gym and am in sortof a hurry. :nice:


EDIT its a HECK of alot better than $849 for new cobra fuel pumps and its tank. Just keep yours above preferrably 1/2 tank and you will be fine. You can run down to a 1/4, but if you corner hard, it may suck air and you will loose fuel pressure. Its Ok if your not in boost though...just get a fuel pressure gauge and see where your safe at.
Click to expand...


I was reading up on the Ford GT pump earlier today. Some dude on another forum said that he called a ford dealer and had him look up the schematics of the GT fuel diagram. And they came to find out that it had 2 of the pumps to have that big of a flow rate. And that one AVIATOR pump outflowed just one of the GT's. It took takes two to out flow the Aviator pump. So people were getting the Aviator pumps instead. Dont know if they knew what they were talking about, but does anybody on here know for sure.
 
#6
spederman said:
I was reading up on the Ford GT pump earlier today. Some dude on another forum said that he called a ford dealer and had him look up the schematics of the GT fuel diagram. And they came to find out that it had 2 of the pumps to have that big of a flow rate. And that one AVIATOR pump outflowed just one of the GT's. It took takes two to out flow the Aviator pump. So people were getting the Aviator pumps instead. Dont know if they knew what they were talking about, but does anybody on here know for sure.
Click to expand...


The GT fuel pump is "supposedly" rated very low. But it does infact out flow the aviators....AND the duel 03-04 cobra pumps :nice: I down loaded an actual flow rate test of the GT pump VS the dual cobras.


TEST RESULTS!

DUEL 03 cobras @ 80PSI (where KB tested them...il show their results later) showed in @ 268.0LPH.

ONE Ford GT 40 pump @ 80PSI flowed 324.7!

KB got 238 out of the cobras @ 80PSI...so 30 less than what this test got. But that doesnt matter...we KNOW the the stock dual cobra setup is good for around 480RWHP.

Now the results...

@ 40PSI the cobras are about 49 LPH ahead
@ 50PSI Cobras are only 18LPH ahead.
@ 60PSI the GT pumps pass the SVTs by 2PSI
@ 70PSI The GT pumps pull away to 28LPH
@ 80PSI its pulling hard @ 56LPH
@ 90PSI Its drove away @ 67LPH


So its pretty clear that the Ford GT pump is hands down much better than the cobras...why? Well who maxes their fuel system @ 40PSI? NOONE. They boost pressure as high as possable to increase injector flow rate...this is why on paper the SVTs seem better, but in reality when you go for gold the Ford GT comes out WAY on top. This is why the Ford GT pump can support 575RWHP+ if setup properly (increased gauge wire so its getting the full 12 or 13Vs)...stock wireing should support easily over 500RWHP. You must also drill holes in the stock GT basket so that the pump can get enough fuel...if you hooked it up to a big 1/2 line it would look like you turned on the water hose...this thing need to be able to breathe.
 
#7
hotmustang331 said:
You must also drill holes in the stock GT basket so that the pump can get enough fuel...if you hooked it up to a big 1/2 line it would look like you turned on the water hose...this thing need to be able to breathe.
Click to expand...


But isnt the hole drilling a debate if it really works or just makes things worse? Some people have actually been saying that drilling holes actually makes it worse and the pump can suck dry the basket even quicker. And that its actually better to leave the basket stock.:shrug: I'm so confused on what to do. It would be nice if i could get the cobra tanks and not worry about always having a 1/2 tank of gas or taking it easy through turns.
 
#8
so wait... im interested in this cause i never heard of it but... your saying that in order to supercharge our cars and push 400rwhp..knowing we would need a new fuel pump... we need to drill holes in our tanks and not drive with less than a 1/2 tank of gas. if this is true im selling my damn gt and buying a cobra asap cause im sick of upgrading and seeing all the cobra upgrades everwhere.. block, fuel system, tanks, heads, axles, brakes. everthing is better!!! :bang: i wonder how much i could get for my stang :shrug:
 
#10
steveb24 said:
so wait... im interested in this cause i never heard of it but... your saying that in order to supercharge our cars and push 400rwhp..knowing we would need a new fuel pump... we need to drill holes in our tanks and not drive with less than a 1/2 tank of gas. if this is true im selling my damn gt and buying a cobra asap cause im sick of upgrading and seeing all the cobra upgrades everwhere.. block, fuel system, tanks, heads, axles, brakes. everthing is better!!! :bang: i wonder how much i could get for my stang :shrug:
Click to expand...


Exactly. I wish i could sell mine and just buy a cobra but i have waaay too much already into it and would never make the cash back.

And yes, the design of the gas tank in the GT sucks because of the bucket that the fuel pump sits in. Its too easy to suck it dry with a large fuel pump and it doesnt fill up very quickly because there are only like 2 holes in it. But i heard if you put more holes in it, then it drains out just as fast as it fills up so you have to always be running with at least 1/2 tanks so you dont drop the fuel pressure and blow your motor. That annoys me and i dont like being restricted so i might just have to do the cobra tank upgrade. Another nice $800 expense.:bang:
 
#13
spederman said:
Exactly. I wish i could sell mine and just buy a cobra but i have waaay too much already into it and would never make the cash back.

And yes, the design of the gas tank in the GT sucks because of the bucket that the fuel pump sits in. Its too easy to suck it dry with a large fuel pump and it doesnt fill up very quickly because there are only like 2 holes in it. But i heard if you put more holes in it, then it drains out just as fast as it fills up so you have to always be running with at least 1/2 tanks so you dont drop the fuel pressure and blow your motor. That annoys me and i dont like being restricted so i might just have to do the cobra tank upgrade. Another nice $800 expense.:bang:
Click to expand...


If you have a 1/2 tank or more, you will be ok...just dont be doing an auto cross with it and you will be fine lol. You can also create a baffleing system with an old gas can...im actually thinking of doing this.

You CAN drive with a 1/4 tank, and the pump will still be mostly submerged...but just avoid going WOT. Its not that bad.
 
#16
hotmustang331 said:
If you have a 1/2 tank or more, you will be ok...just dont be doing an auto cross with it and you will be fine lol. You can also create a baffleing system with an old gas can...im actually thinking of doing this.

You CAN drive with a 1/4 tank, and the pump will still be mostly submerged...but just avoid going WOT. Its not that bad.
Click to expand...


Yeah, i decided to follow in your footsteps. Just called Randy and ordered a GT40 fuel pump also. (thanks Randy :D ) I would have liked to do the cobra tank upgrade, but it would end up costing $900 new and they are hard to find used. So screw it, i'll just have to learn to drive with at least a 1/2 tank of gas.

Hotmustang331, if you find out how to create your own baffles and it looks like it will work, let me know. I wouldnt mind doing something like that too.
 
#17
^ Im going to look into that...ill let you know if I find anything.

Last I heard is that you can do it with an old gas can lol. So maybe bolt it down with sides about 5 inches high and some small holes on the bottom of the sides. That wouldnt let the gas out fast....but the pump couldnt drain the whole tank down as fast as the holes would let gas in.
 
#18
Ok here is what I posted in another thread....seems more needed here though haha.

Ok here is what I did to my basket....shouldnt drain the basket now :lol: .

View attachment 456414

View attachment 456416

View attachment 456418

Codystwinturbos042.webp


And the pump W/ its filter...and how it sets in the basket. No wonder the darn thing drains the basket in stock trim.

Codystwinturbos033.webp


View attachment 456424

View attachment 456426
 
#19
:eek: Thats some big holes! I know you have probably done a little more reading into it than i have, but do you think thats too many? With that many holes, how full do you think you'll have to run your fuel tank if your going WOT so it doesnt drain quicker than it can fill up again? I would say like 3/4 tank to be safe, so i doesnt drain out.

Is that the best place to drill those holes, one of the threads i was reading on m-depot said to drill a couple in the bottom of the basket and you would be good to go. So confusing...

(wierd, this thing astericks out if i put the name of another forum, odd)
 
#20
I doubt it....its setting on the bottom of the gas tank...you would literly have to push all the gas to the other side to make the section empty. In the case if the stock basket, it relys on pressure to push gas up from the bottom...if it got that low, the fuel pump would quickly drain the basket and there wouldnt be any pressure to push fuel up into the basket anyways :shrug: .

I see this modifcation as a huge improvement. It would require the fuel to get very low before it go lower than that bottom hole, even in a turn or going WOT. Then sloshing would be filling the basket fast with the holes there, yet it still is able to maintain fuel in the bottom of the basket, and the hole in the bottom will trying to fill the basket right under the pump.
It shouldnt starve at all above a 1/2 tank.
And should be fine for staright line down to around a 1/4 tank, but I wouldnt try it :D
 
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