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Old 05-03-2012, 12:12 PM   #1
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Curious about fuel lines

Does it help at all to get bigger fuel lines? At what point in modding your car would you need bigger fuel lines?
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Old 05-03-2012, 12:46 PM   #2
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R u talking bout the fuel rails or complete fuel lines that run under the car.
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Old 05-03-2012, 04:12 PM   #3
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The factory lines are good for a long while. Unless you go with a big s/c I wouldn't bother with them.
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Old 05-03-2012, 08:00 PM   #4
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Re: Curious about fuel lines

Once you start getting over 400 HP, you should probably start looking at fuel supply improvements.
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Old 05-04-2012, 09:14 AM   #5
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Thanks, that's basically what I thought but some guy was talking about switching his to a bigger size. Not many mods either.
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Old 05-04-2012, 09:55 AM   #6
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I have a stock fuel rail on my 90 and it 400+ you should be fine until you get a turbo kit jk lol
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Old 05-04-2012, 10:48 AM   #7
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Only reason I have new fuel rails is because they look better than stock
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Old 05-04-2012, 09:24 PM   #8
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Re: Curious about fuel lines

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I have a stock fuel rail on my 90 and it 400+ you should be fine until you get a turbo kit jk lol
I'd be interested to see what your fuel pressure and flow is doing at WOT.


Being paranoid as I am, I will be running 60 lb injectors, aftermarket fuel rails & pressure regulator, an AFM 340 lph & Vortech T-Rex fuel pumps to feed my engine. Of course I am starting with an engine that produces a bit over 400 HP NA and I'm looking to develop 600+ HP if possible with my combination.
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Old 05-04-2012, 09:48 PM   #9
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Yeah it is all stock... I really don't know about the pressure at wot.. But they are 42lb injectors.. Stock regulator stock rails
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Old 05-04-2012, 09:50 PM   #10
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i think with a bigger line the pressure may actually decrease a little. but the flow would increase.
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Old 05-04-2012, 09:51 PM   #11
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Only have the 2 walbro 255 pumps 1 in line 1 in tank.. I will re-tune and upgrade with new short block next yr.
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Old 05-04-2012, 09:53 PM   #12
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if you had it tuned, which im sure you did. i would think that they used a wideband. and in that case you would have known if you had inadequite supply.
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Old 05-04-2012, 10:14 PM   #13
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Re: Curious about fuel lines

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i think with a bigger line the pressure may actually decrease a little. but the flow would increase.
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if you had it tuned, which im sure you did. i would think that they used a wideband. and in that case you would have known if you had inadequite supply.
Yes, it probably would decrease and the flow rate will increase. You wouldn't have to work the pumps as hard to supply an adequate amount of fuel. Plus with the smaller lines you will eventually reach a plateau where more pressure will not deliver more fuel. Stock lines can be utilized close to that point at the expense of your pump(s).


I'm sure they found it enough fuel or he would have had a meltdown by now. What I'd like to see is a graph of the fuel flow rate (most places won't have it) to see how close to maxed out his fuel system is.
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Old 05-05-2012, 04:41 AM   #14
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Quote:
Originally Posted by Trojan Horse

Yes, it probably would decrease and the flow rate will increase. You wouldn't have to work the pumps as hard to supply an adequate amount of fuel. Plus with the smaller lines you will eventually reach a plateau where more pressure will not deliver more fuel. Stock lines can be utilized close to that point at the expense of your pump(s).

I'm sure they found it enough fuel or he would have had a meltdown by now. What I'd like to see is a graph of the fuel flow rate (most places won't have it) to see how close to maxed out his fuel system is.
Yeah, I would be a little curious to.
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Old 05-05-2012, 07:18 AM   #15
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Yeah it was tuned once by hpp tuners and 1yr ago by speedtek the best in DFW.. I plan to have it re-tuned soon when I make some small changes.. She is a monster I have the rev-limiter at 5600. To keep out of higher rpm's but it will make to much power if they run into 6000+ this is just a economical tune.. It has more in it just don't wanna pop it.. I don't know much about fuel pressure on forced induction cars.. But the tuners are very smart and never told the previous owner to upgrade the rails and regulator.. One day I will but I'm waiting to finish my 408..
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