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Ok so we see many cars making big power but no mention of "fuel line" changes.That line from the tank to the rail is awfully small !!! When does it need to be changed out to a larger size? My race car used to run a # 10 line to the injector rail so I am used to bigger is better LOL. My current setup is ...Factory filter removed,looped rail with center inlet and fuel filter mounted right at the line, Aeromotive regulator and return line back to tank.Stock injectors as well. So...I covered everything but the feed line.
Just stepped up to a 77 pulley and although AFR's are still low..10.8 I have not run it flat out through 4th gear to test. Have a 1/2 mile roll race,much longer pull than 1/4 mile so more to ask of fuel system, coming up and don't want any surprises. What do you guys think? Step up to 3/8"?
Your AFR shouldn't change over a longer run, but bigger is still better as long as there's no bottle neck at the pump.
That is a lot to ask of your intercooler though.
Your AFR shouldn't change over a longer run, but bigger is still better as long as there's no bottle neck at the pump.
That is a lot to ask of your intercooler though.
Can I get some more info on your Current setup? I have dual 450lph pumps to toss in but need to design engine bay side. I am wondering how you ran the return side and how your aero regulator ties into the system...
Please share even if by PM =D
+1 on stock line is fine until what 550+whp? Thats where I would start to want to upgrade for simple piece of mind
Check fuel pressure while running under load so long as it's above 4.1 Bar forget about it and enjoy your high speed pulls
My 185mm at about 5500 rpms in 4th gear IATs would climb to 175-180 degree after a 2-3-4 pull and AFR would drop into the 9.8x range dumping fuel that is with stock pumps stock lines and 60lb injectors so yea, there is enough fuel to feed that beast. Though I would think your stock injectors are hitting the edge of their limit.
Now with meth I do not see over 125 degrees and its not dumping fuel like it used too. I even gained 1-1.5PSI by using a DO3 pre supercharger and DO7 post intercooler...
Everyone needs to get addicted to meth in this man's humble opinion
Last edited by BoostedAero; 04-20-2017 at 08:31 AM.
OK i will takes some pics tonight because I have a slight fuel leak at the tank that needs to be taken care of so i will be in there tonight. I may jump up to a 3/8 line for the hell of it as well but the small hose coming off the pump will be the challenge.
As far as IAT's go I am at 80* on a 60* day on a 6000 rpm 3rd gear pull.Still have 4th gear to go so she will climb more.
I know I've said it before... But I'm building some fuel lids for the pass side that should accommodate pretty much any build up to about 900whp (on E85).
As far as the stock line goes... I know folks have made upwards of 600whp on gas without having any issues. It measures about .240" ID
We have made ~600whp on E70% but at that level we were getting enough pressure drop that it prompted the install of a larger fuel line. That 600whp was made with upgraded pumps as well (2x Walbro 450's in the factory baskets). The stock pumps started dropping pressure at about 575whp.
Current setup is the Walbros (out the pass side (drivers side is completely bypassed), -10AN feed into filter/reg, -6AN return to tank. -10AN all the way to the front, Wye to 2x -6AN, split fuel rail with a -6AN inlet on each.
I know I've said it before... But I'm building some fuel lids for the pass side that should accommodate pretty much any build up to about 900whp (on E85).
As far as the stock line goes... I know folks have made upwards of 600whp on gas without having any issues. It measures about .240" ID
We have made ~600whp on E70% but at that level we were getting enough pressure drop that it prompted the install of a larger fuel line. That 600whp was made with upgraded pumps as well (2x Walbro 450's in the factory baskets). The stock pumps started dropping pressure at about 575whp.
Current setup is the Walbros (out the pass side (drivers side is completely bypassed), -10AN feed into filter/reg, -6AN return to tank. -10AN all the way to the front, Wye to 2x -6AN, split fuel rail with a -6AN inlet on each.
Thanks
Dave
*Sorry in advance for thread jack*
@Dave
Dave, I am in for one when every you finish up... is the pricing still consistent with your "billet fuel lid thread"?
@SICAMG
That would be mighty kind of you to throw up some pics or PM
Last edited by BoostedAero; 04-20-2017 at 03:09 PM.
Reason: Thread Jackkked :-/
Ok so we see many cars making big power but no mention of "fuel line" changes.That line from the tank to the rail is awfully small !!! When does it need to be changed out to a larger size? My race car used to run a # 10 line to the injector rail so I am used to bigger is better LOL. My current setup is ...Factory filter removed,looped rail with center inlet and fuel filter mounted right at the line, Aeromotive regulator and return line back to tank.Stock injectors as well. So...I covered everything but the feed line.
Just stepped up to a 77 pulley and although AFR's are still low..10.8 I have not run it flat out through 4th gear to test. Have a 1/2 mile roll race,much longer pull than 1/4 mile so more to ask of fuel system, coming up and don't want any surprises. What do you guys think? Step up to 3/8"?
Interesting question, I also wondered about the pumps a while back. At this point my entire fuel system is stock except for changing to 52 lb injectors. The complete tank assy w/ pumps and filter was replaced by MB under the factory warranty extension in April 2016. I have no real worries at this point. Will be running the Mile next month hoping to exceed 180 w/ changes made since last year there.
The complete tank assy w/ pumps and filter was replaced by MB under the factory warranty extension in April 2016. I have no real worries at this point.
Please check your fuel pressure/inspect/test voltage after tank warranty work... I posted a thread about it. I say this assuming that not everyone logs their really nice and "its running fine" mercedes
Well this got interesting. Installed the larger fuel line today and was very supprised at how small the stock line is.....and it really works for our high horsepower cars as well !!!!! There is an insert at the very beginning of the fuel line where the hose clamps on that restricts it even more than the line itself.The diameter is is .186. Than another insert about a foot away to connect to the line that run's all the way to the front rail.I stepped up to a size of .340 steel tube from the pump to the rail.
Again stock works great for most but I just couldn't see a future with this little line in there.
Forgot to mention that the regulator had to be turned down 1 full turn due to pressure going from 74 psi to 82 psi after line swap. The line for sure makes a difference.
Well this got interesting.... had to be turned down 1 full turn due to pressure going from 74 psi to 82 psi after line swap. The line for sure makes a difference.
No. It's the return line. I ran steel because I have found that after a few years the steel braid line starts getting "stiff' from the fuel,especially race fuel. So I felt that a regular steel line would be the safest. No pictures but all I did was follow the factory route.
No. It's the return line. I ran steel because I have found that after a few years the steel braid line starts getting "stiff' from the fuel,especially race fuel. So I felt that a regular steel line would be the safest. No pictures but all I did was follow the factory route.
Did you hotwire the pumps to run with key on constant?
I don't know about that. Every car I have ever worked on only cycles the pump, than will shut off if you do not start the engine. Really no reason to have it any other way really, Just my 2 cents.
04-19-2017, 10:06 PM
