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Re: Ok guys, your thoughts on fuel systems [Re: CMcAllister] #1457372
06/28/13 08:11 PM
06/28/13 08:11 PM
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W. Kentucky
justinp61 Online content OP
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Sorry for the delay but I have to work sometime .

I flowed my pump today, five tests. In all test there was an open ended piece of 8an line 3' long on the fitting and were ran for 1 minute.

#1
At the pump, gas cap off, just a touch over 2 gallons.

#2
At the bulkhead fitting in the fenderwell right before the regulator, gas cap off. Just a touch under 2 gallons.

#3
Through the regulator and empty filter housing, cap off. 7 quarts.

#4
Same as #3 with filter element in, 7 quarts.

#5
Same as #4 with gas cap on, 7 quarts.

What do you guys think? This is a 150gph pump and it's flowing 120gph without any restriction. Is the 8an from the tank to the pump hurting it?

Thanks .

Re: Ok guys, your thoughts on fuel systems [Re: justinp61] #1457373
06/28/13 08:38 PM
06/28/13 08:38 PM
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Romeo MI
MR_P_BODY Offline
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What was the voltage at the pump during your testing
and what is the voltage when the car is running with
all the elec load

Re: Ok guys, your thoughts on fuel systems [Re: MR_P_BODY] #1457374
06/28/13 09:52 PM
06/28/13 09:52 PM
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justinp61 Online content OP
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12.15 at the pump with the engine not running as tested, 13.5 running.

Re: Ok guys, your thoughts on fuel systems [Re: justinp61] #1457375
06/28/13 10:13 PM
06/28/13 10:13 PM
Joined: Jun 2003
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Romeo MI
MR_P_BODY Offline
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Quote:

12.15 at the pump with the engine not running as tested, 13.5 running.




The lower voltage could account for the lesser flow..
try it at 13+ or try using a -10 line on the inlet
of the pump... I would do this testing in a couple
of 5 gal buckets

Re: Ok guys, your thoughts on fuel systems ** UPDATE** [Re: justinp61] #1457376
06/30/13 11:13 AM
06/30/13 11:13 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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This is not a total fix, but may get you to a runnable setup with much closer top end AFRs. The bigger needle and seats will require a lot less pressure to feed the bowls. You pick up over 20 percent flow AREA going from .110 to .120 seat diameter. I ran into this problem many years ago. My system was fine on twin holleys with a tunnelram, not so when I went to a single Dominator with only two needles and seats. Even though there was a pressure drop at the gauge on the top end, with four needles and seats the system was able to keep up.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Ok guys, your thoughts on fuel systems ** UPDATE** [Re: gregsdart] #1457377
06/30/13 02:27 PM
06/30/13 02:27 PM
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justinp61 Online content OP
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Thanks Greg. Will going from 8an to a 10an really make that much difference with a 3/8" inlet on the pump. I wish it had a 1/2" or bigger.

Re: Ok guys, your thoughts on fuel systems ** UPDATE** [Re: justinp61] #1457378
06/30/13 02:40 PM
06/30/13 02:40 PM
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Ambridge, Pa.
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rickraw Offline
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u get more supply volume with a #10 line. u should have a filter before the pump. i run a #10 line clear to the reg, then have #6 to the carb. i also have a filter before the reg too. 140 mallory g-rotor pump, dead headed. i can hold it to the floor all day. pressure only drops 1/2#.

Re: Ok guys, your thoughts on fuel systems ** UPDATE** [Re: rickraw] #1457379
06/30/13 06:58 PM
06/30/13 06:58 PM
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justinp61 Online content OP
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If I could buy a 10an to a 1/2" tube compression I'd change out all the 8an, The id of the 8an fittings is only 3/8". If I had known this going in I would've ran 10an and 5/8" tube.

Re: Ok guys, your thoughts on fuel systems ** UPDATE** [Re: justinp61] #1457380
07/05/13 12:50 PM
07/05/13 12:50 PM
Joined: Oct 2003
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justinp61 Online content OP
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I ordered a piece of 10an line and the fittings necessary to hook to the pump and tank along with a set of .120 needle and seats. I'll flow the pump again next week after the new line is on to see if anything changes.

Thanks, Justin

Re: Ok guys, your thoughts on fuel systems ** UPDATE** [Re: justinp61] #1457381
07/10/13 09:43 PM
07/10/13 09:43 PM
Joined: Oct 2003
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justinp61 Online content OP
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Changed out the 8an to the 10an today and flowed the pump again, seven quarts. Same as before. I also installed a pair of .120 needle and seats. Maybe tomorrow night I'll get to test and tune.

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