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Old 04-12-2012, 07:20 PM   #1
mustang434
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Default Holley 12-803 anybody have this problem

I have been having this issue where i flow my nos before a run set the pressure make the run and recheck and have a pound difference plus or minus. Rebuilt it still the same issue. I recently put an alternator but i flowed with a charger on it. the pump is a a1000 with the aeromotive by pass regulator made for carb. the set up is a year old never had this issue. i am going to replace the regulator.also no fluctuation in gauge either. Thanks for any input.
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Old 04-13-2012, 06:54 AM   #2
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Default Re: Holley 12-803 anybody have this problem

yes they tend to move a little. a pound of change is stretching the large end of the spectrum. sounds like the initial pump hit of pressure is hammering the spring........pop a gauge on that thing and see if the pressure is spiking at any point
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Old 04-13-2012, 09:35 AM   #3
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Default Re: Holley 12-803 anybody have this problem

I either had this discussion with you, or someone with the same issue on the phone. It is not the regulator............it is something in the fuel system, or the voltage to the pump. There is nothing in that regulator to wear, other than the spring and diaphram get weak, so that means there is nothing that will change the regulated pressure output that much......EXCEPT what the regulator sees on the inlet side............meaning the fuel system output.

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Old 04-13-2012, 01:51 PM   #4
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Default Re: Holley 12-803 anybody have this problem

No Monte that was not me but thanks for the info. Do you think a bleed line may be needed?
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Old 04-13-2012, 10:03 PM   #5
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Default Re: Holley 12-803 anybody have this problem

i am taking that you have a A1000 pump with the carb regulator? but with the carb regulator it was funny on the gauge.

i use to run that one also "CARB REGULATOR". i switched mine over to the universal one so i could get 25lbs of pressure before the nitrous regulator and carb.

but i have always used the bleed system so i haev never try the dead head setup.
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Old 04-13-2012, 10:21 PM   #6
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Default Re: Holley 12-803 anybody have this problem

I had the same thing on my carb side with the same pump/regulator set up (A1000 feeding a 13204 bypass, which is feeding a Holley 803 for the carb). I haven't plumbed the nitrous side of my fuel system yet, so I can't speak to that specifically.

But basically I noticed I couldn't control the pressure going through the 803 if the motor was off (carb not flowing fuel) and the pump was on. If I set the bypass to 10psi, the pressure to the carb after the 803 was also 10psi. If I backed the bypass reg down to 6psi, the carb pressure would fall to 6psi. The only time I could independanly adjust the pressure before and after the 803 is if the motor is running and the carb (and 803 reg) is flowing fuel. I now have the bypass set to 12psi and the carb (803) set to 6.5psi. If I shut the motor down and leave the pump on.......the carb pressure will almost instantly spike to 12psi. I'm sure I could cure this by adding a restricted bypass.

So, when I plumb in the other 803 regulator to feed the plate system, I am definately going to add in a bleed return back to the cell from it. From what I've seen on my carb side and from everything I've read on here so far, it seems like keeping the 803 constanly flowing fuel is the only way to keep the fuel pressure accurately regulated.........at least with my A1000. I'm very new to this, so take this for what it's worth. Others with much more experience may have seen/done other things. This is just what I've noticed with my set up so far.
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Old 04-13-2012, 10:55 PM   #7
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Default Re: Holley 12-803 anybody have this problem

What type of gauge are you using to flow the fuel pressure?
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Old 04-14-2012, 09:23 AM   #8
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Default Re: Holley 12-803 anybody have this problem

Iam using an oil filled gauge. CHm brand trhat that murrays speed shop sells. I may try a bleed on the nos regulator.
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Old 04-14-2012, 12:50 PM   #9
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Default Re: Holley 12-803 anybody have this problem

Temperature affects some analog gages in my experience.
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Old 04-14-2012, 03:21 PM   #10
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Default Re: Holley 12-803 anybody have this problem

13204 is the one i had be for i had it maxed out at 15psi to feed my carb and nitrous

13301this is the one i switched too. it fixed my problems i had. i put the line pressure at 25lbs it still feeds carb and nitrous. no more pressure moving.
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Old 06-22-2014, 12:45 AM   #11
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Default Re: Holley 12-803 anybody have this problem

Im wanting to make my regulator "bleed" to return. Is this as simple as fittin a carb fuel jet in one of the outlet fittigs and returning i to the cell?
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Old 06-22-2014, 02:00 AM   #12
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Default Re: Holley 12-803 anybody have this problem

nevermind, after reading other threads, im just gonna let 'er creep.
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Old 06-22-2014, 11:02 AM   #13
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Default Re: Holley 12-803 anybody have this problem

Larger line after the pump will absorb some of the fluctuation you see on the gauge as well. I run a -8 or -10 just for the fuel side of the nitrous with a blue pump. Works great with no bypass.
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Old 06-22-2014, 11:17 PM   #14
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Default Re: Holley 12-803 anybody have this problem

Changes in atmospheric pressure will change how a liquid filled gage reads. The back of them needs to be vented fairly often by removing the little rubber plug and exposing the internals to atmospheric pressure.
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Old 06-23-2014, 10:55 AM   #15
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Default Re: Holley 12-803 anybody have this problem

Quote:
Originally Posted by mustang434 View Post
I have been having this issue where i flow my nos before a run set the pressure make the run and recheck and have a pound difference plus or minus. Rebuilt it still the same issue. I recently put an alternator but i flowed with a charger on it. the pump is a a1000 with the aeromotive by pass regulator made for carb. the set up is a year old never had this issue. i am going to replace the regulator.also no fluctuation in gauge either. Thanks for any input.
Can you post a picture of the engine compartment? I have seen people run a Holley 12-803 and supply it off the outlet of another regulator. They will never work correctly like that. You're flowing pressure is plus or minus 1-pound after you make a pass and check it again? If this is the case then you have supply issue before the regulator. It should be set exactly where you flowed it at, when you recheck it. They don't move like that, there is definitely an issue somewhere. I recommend taking the regulator off and look in the inlet for trash. I would also check the accuracy of that gauge and make sure it repeats. I agree with Monte on the supply issue.

I wouldn't recommend a by-pass/bleed jet on that regulator either.

Last edited by Nitroushp; 06-23-2014 at 11:00 AM.
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