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 .

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

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

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.

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.

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#.

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.

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

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.