Do I need a regulator? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 20 (permalink) Old 05-02-2007, 12:46 PM Thread Starter
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Do I need a regulator?

I have a holley 110 GPH fuel pump that Flows 110 gph free flow at 6.5-8 psi maximum. I have a regulator on it and I have adjusted to the max but still only get about 5lbs of pressure. My problem is in second gear the car coughs and sputters and 5600 rpm and I have to shift. I jetted the carb up to 68p and 76s still the same. Should I put a pressure gauge on the cowl to watch it in 2nd or just bypass the regulator?? I thought that I heard holley carbs can't handle over 7lbs on pressure?




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post #2 of 20 (permalink) Old 05-02-2007, 02:10 PM
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Do I need a regulator?

Most o the Holley pumps require a regulator and a lot of the Holley regulators suck. I would remove the reg and verifiy system pressure. I set mine at 6.5 PSI. This is why I run Mallory pumps - the Mallory 110 in the Mustang is internally regulated at 7 and it's an install and run deal. We've had no issues with it, running a 400 HP 351C, shifting at 6000+ twice per pass. 3/8" stock line and stock pickup, large Fram filter.

I started with a system using a Holley 110 and a regulator and had similar problems. I did two things - 1) replaced the tank pickup with a 3/8 line and 2) sold all the Holley fuel stuff at a swap meet.

The Falcon runs a 140 GPH return system, it's good to near 600HP.





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post #3 of 20 (permalink) Old 05-02-2007, 02:38 PM Thread Starter
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Do I need a regulator?

Thanks I think I will remove the regulator tonight and check the pressure and maybe adjust the floats if needed. By the way I bought a Boss Hog street bandit 3200 to 3600 for my car and it works awesome! He just came out with it for the old 24 spline trans which is not listed on his site and that's what I had. The price was right and I can't wait to see if my 60' times are in the 1.?? insted of 2.13 average.


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post #4 of 20 (permalink) Old 05-02-2007, 02:51 PM
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Do I need a regulator?

Just a thought, isn't it amazing that an engine can suck ~100gph through four tiny-ass orifices in the carb? What kinda velocity would the fuel have to wedge through the jet that quickly? Friggin amazing lol.

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[ This Message was edited by: Motorhead on 5/3/07 5:51am ]
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post #5 of 20 (permalink) Old 05-02-2007, 07:32 PM Thread Starter
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Do I need a regulator?

yeah I never thought it would happen with my motor. It seems pretty tame compared to the cars on this site..ha-ha


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post #6 of 20 (permalink) Old 05-03-2007, 06:48 PM
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Do I need a regulator?

i run no regulator at 8psi

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post #7 of 20 (permalink) Old 05-03-2007, 07:46 PM
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Do I need a regulator?

I have a couple of questions for you. Are you using a liquid filled gauge to measure your fuel pressure? Where is the gauge located? What size filter are you using? Have you replaced the fuel line and what size line do you have? Here is why I'm asking these questions. Liquid filled gauges in the engine compartment can screw you up. The internal pressure of the liquid filled gauge can change drasticle with temperature change. This would result in a false pressure reading. If the filter micron rating is on the small size (10 micron) you could cause the pump to cavitate when demand increases. It is recommended to use a 100 micron filter between the tank and pump. A 10 micro filter should be placed beteen the pump and the carb. If the fuel line has been changed there may be a small air leak that can cause the pump to cavitate. Do you have a way to measure your air fuel ratio during a run? Good luck.
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post #8 of 20 (permalink) Old 05-03-2007, 07:54 PM
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Do I need a regulator?

What kind of carb do you have on it?
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post #9 of 20 (permalink) Old 05-03-2007, 08:58 PM Thread Starter
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Do I need a regulator?

I am using a holley gauge that is on the duel feed line. I have a JEG'S Compact Billet In-Line Fuel Filters with a a removable 40 micron stainless element. I have the stock metal fuel line. Yeah I have a ;iquid filled autometer gauge that I am going to put on the cowl. Dont really have a good way to measure air fuel. What would I need? I have a holley 650 DP on the car. I took the refulator off tonight and I am going to test the car tomorrow. One thing that I did notice is that now that I increased the jets it seems to sputter in 1st to 2nd after 5600 instead of doing it in 2nd to 3rd. I will try it and let you guys know, thanks for the input.


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post #10 of 20 (permalink) Old 05-03-2007, 09:01 PM
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Do I need a regulator?

Quote:
On 2007-05-02 14:51, Motorhead wrote:
Just a thought, isn't it amazing that an engine can suck ~100gph through four tiny-ass orifices in the carb? What kinda velocity would the fuel have to wedge through the jet that quickly? Friggin amazing lol.
I watched my 351C do it repeatedly with 5 PSI showing on the gauge at the carb. That was the old dead head system. Sucker shut down at 5300 like it had a rev limiter. Experienced racer says "out of fuel". I say "Bah, got pressure". "Out of fuel" "Bah" "Out of fuel" "Bah" - changed pumps and fuel setup, discoverd stock pickup necked down to less than 5/16"...hmmm must have been out of fuel.





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post #11 of 20 (permalink) Old 05-03-2007, 09:06 PM Thread Starter
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Do I need a regulator?

Yeah I think that you are right I just cant believe my cars needs that much fuel I only in the 14's. With a mild setup but I guess I will keep working with it and see what happens. Thanks CKelly


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post #12 of 20 (permalink) Old 05-03-2007, 11:43 PM
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Do I need a regulator?

I used to run stock lines and a Holley 110gph mech pump.I installed a gage at the cowl and watched the pressure go away at 5000.
I did what you guys told me:changed fuel lines to 3/8" from pickup to carb,put in larger jets and the pressure only drops to 4.8-5psi.
The car runs awsome,what a difference.
By the way the old crappy filter gave up,changed to a better one and gained a little pressure there too.
Have a nice day/Gresse
I run no regulator.
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[ This Message was edited by: gresse on 5/4/07 4:04pm ]

[ This Message was edited by: gresse on 5/4/07 4:17pm ]
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post #13 of 20 (permalink) Old 05-04-2007, 03:50 AM
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Do I need a regulator?

A hard and fast 1/4 mile run will easily use 1/4 to 1/2 a gallon of gas.

So 1/2 gallon + pumping action in 13 seconds is what is needed to keep your bowls filled.
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post #14 of 20 (permalink) Old 05-04-2007, 05:09 AM
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Do I need a regulator?

I pulled my old gas tank in the 63 and drilled out the old pick-up tube & replaced with 3/8 line. Your 65 is probably same as the 63, just a sippin' straw.
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post #15 of 20 (permalink) Old 05-04-2007, 07:27 AM Thread Starter
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Do I need a regulator?

Where did you get the 3/8 line for the car? I see that Crites has the sender.


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