Fuel system setup question. - Chevelle Tech
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post #1 of 6 (permalink) Old Apr 15th, 19, 4:36 AM Thread Starter
 
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Fuel system setup question.

I was hoping to get a little input on my setup to make sure I get it right the first time. I have a 72 chevelle, I have been doing a lot of work on it and getting it ready for this summer. I currently have a mild 468 in the car, but for next year I have a pump gas 540 for it. The car will stay pump gas, and will primarily be a street driven with trips to the track on some weekends. For the fuel setup I have a sumped tank, and am installing a Mallory 250 pump, thru a relay located in the trunk not far from the batt. I have an inline 40 micron filter before the pump, and another 40 micron filter up front going to the fuel log. I am running a bypass regulator to a HP950. I know this system is overkill for the 468, I tend to over do everything for the 468 I have, but am building it to handle the next engine going in the car. My question is what size fuel line should I run, I am thinking -8 supply and return from back to front would be sufficient, but want to be sure, I can also do -10 supply and return from the rear to the reg, and then branch down to -8 feeding the carbs, but not sure if that is too much? Not really sure if there is such a thing as too much to be honest, just wanting to get input on the setup, from more experienced guys. Thanks fellas
Ronnie
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post #2 of 6 (permalink) Old Apr 15th, 19, 1:07 PM
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Rick
 
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Re: Fuel system setup question.

Typically you go 100 micron before the pump and 40 micron or smaller after the pump.

-10 to the regulator won't cost much more and will ensure plenty of room to grow. -8 as a return from the bypass regulator is fine. But -8 to and from the regulator will work just as well.

-8 to the bowls is fine, really -6 is fine. The flow through a single .150 needle and seat is much smaller than the -6 line itself.

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post #3 of 6 (permalink) Old Apr 15th, 19, 2:24 PM
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Re: Fuel system setup question.

Quote:
Originally Posted by Calculated Risk View Post
Typically you go 100 micron before the pump and 40 micron or smaller after the pump.

-10 to the regulator won't cost much more and will ensure plenty of room to grow. -8 as a return from the bypass regulator is fine. But -8 to and from the regulator will work just as well.

-8 to the bowls is fine, really -6 is fine. The flow through a single .150 needle and seat is much smaller than the -6 line itself.
I agree with all of this. 10 doesn't cost much more than 8, but 8 would work on a street car. I ran #10 to the regulator and 8's to the carb though 6's will work there as well due to the small flow. My car made almost 1000 hp on that setup as well.

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post #4 of 6 (permalink) Old Apr 16th, 19, 1:22 AM Thread Starter
 
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Re: Fuel system setup question.

Thanks Fellas, I will feed -10 supply and return to the regulator. I went with a 40 micron pump inlet filter because the Mallory is a gerotor style pump, I was reading it was recommended to run a finer filter than the 100 for this style pump because it can clog and bind easier than a rotary vane style pump. hope the 40 is not too fine of a filter,
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post #5 of 6 (permalink) Old Apr 16th, 19, 2:56 AM Thread Starter
 
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Re: Fuel system setup question.

No sir, a 40 micron filter will catch much smaller particles than a 100 micron filter will
40 micron = .00157 inch
100 micron = .00393 inch
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post #6 of 6 (permalink) Old Apr 16th, 19, 3:01 AM
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Re: Fuel system setup question.

Yeah I was trying to flip it around, after I posted. sorry

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