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How Much HP with STOCK fuel lines/rail?

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Kent Buckles

BBBAAD 6
Joined
Feb 8, 2002
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234
:confused: I have asked a few people this and the opinions seem to vary a lot! Assuming the fuel pump will handle this. Looking for input on how much Horsepower the stock fuel rails and fuel line will support? Especially guys who still run stockers with substantial HP. Trying to make a decision on new stock lines or upgrading to braided! Thanks!!!
 
Low 600's to the wheels, anything after that you better go to a 10n fuel line to feed the beast.
 
Just remember that the stock feed line is actually only a 1/4 inch line. I know, I know...... "Hey!, my GN has a 3/8" line!!!" Well hate to break it to ya, but at every Saginaw fitting (fuel rail, filter, out of frame) it necks down to .257" for the o-ring retainer. So it still amazes me that some guys get enough fuel through a 1/4" line to feed over 700 hp. WOW!! Kinda scary when you thnk about it. Then there are guys that SWEAR you NEED a -10AN line to feed a 750 HP engine. I'll wager to say that you could feed over 900HP with a single -6AN (gasoline and EFI, mind you.) Probalby more efficiently, too. Just think of all the added weight of a -10AN system. Now lets talk about cost.......:eek:
 
The fuel system needs attention if the car is going 135+mph in the quarter. Some have gone over140. Some are melting the #1 cylinder at 135-136. Not worth risking your expensive engine because of lean out.
 
The fuel system needs attention if the car is going 135+mph in the quarter. Some have gone over140. Some are melting the #1 cylinder at 135-136. Not worth risking your expensive engine because of lean out.

So is it the rail design that causes that?
 
The fuel system needs attention if the car is going 135+mph in the quarter. Some have gone over140. Some are melting the #1 cylinder at 135-136. Not worth risking your expensive engine because of lean out.

Is most of these guys running alky at those speeds with the stock lines? Or race gas only?
 
I know of 2 personally that have gone mid 9's at 147 to 150. Heard of a guy running 160 with stock lines, double pumper, external XP pump. I am going to be running the set up out of the one mid 9 sec car this year, shooting for 140 to 145.
 
So is it the rail design that causes that?

Most likely the way the rail is fed is the problem because when hey switch to a dual fed rail setup like Champions i goes away. They are usually feeding with a -8 that splits to a pair of -6 going to each side of the engine
 
I know of 2 personally that have gone mid 9's at 147 to 150. Heard of a guy running 160 with stock lines, double pumper, external XP pump. I am going to be running the set up out of the one mid 9 sec car this year, shooting for 140 to 145.

160 with stock lines? Who was it. Doesnt seem too realistic to me. 1150+hp through stock lines.
 
The fuel system needs attention if the car is going 135+mph in the quarter. Some have gone over140. Some are melting the #1 cylinder at 135-136. Not worth risking your expensive engine because of lean out.



Well i have had a problem with feeding #55's on a bank2bank system. I think that if one is using large injectors and a bank2bank efi the fuel rail needs to be fed on both ends.


I seem to have enough fuel till about 4800 rpms and then it goes lean.

but a friend of mine with xfi with 55's and a single pump has more than enough fuel.
 
72'S and meth here with stock lines and rails....138mph and high 9's. i had a problem on the number one cylinder at one time as well but with the xfi i just added fuel into that cylinder but had other issues after that and still have yet ot put the car back together. plan on running even faster this year on the stock heads
 
With an external regulator, you might be able to solve the #1 cylinder lean out. You can make one of these yourself, or I can make one for you. I have enough parts for 4-5 more. I had a machine shop make parts for me. I just weld them up. A vendor needs to start making/selling these. I am busy at work, and don't have time to deal with alot of people.

This plugs right into the stock fuel rail where the pressure regulator goes, and allows you to run a -6AN to an external regulator.
 

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Well i have had a problem with feeding #55's on a bank2bank system. I think that if one is using large injectors and a bank2bank efi the fuel rail needs to be fed on both ends.


I seem to have enough fuel till about 4800 rpms and then it goes lean.

but a friend of mine with xfi with 55's and a single pump has more than enough fuel.

Ive run 83's to 70% with no problems on mine
 
Why push it?

If you have enough HP to be worried about it....you have already spent stupid money. Why cheap out on fuel? If that's your reason..

If stock appearing is the reason...get over it. When you are at the track running 140mph...nobody's gonna think its stock anyway.

Why take a chance on blowing you motor?

Anyway..just my 2 pennies.
 
Why push it?

If you have enough HP to be worried about it....you have already spent stupid money. Why cheap out on fuel? If that's your reason..

If stock appearing is the reason...get over it. When you are at the track running 140mph...nobody's gonna think its stock anyway.

Why take a chance on blowing you motor?

Anyway..just my 2 pennies.

+1
 
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