If I am running a MC2100 do I need a fuel Regulator? - JeepForum.com
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Unread 07-13-2009, 11:40 PM   #1
Matsuno
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If I am running a MC2100 do I need a fuel Regulator?

I found a holley regulator and a Jegs gauge through some of the other threads.

Holley reg: http://www.jegs.com/i/Holley/510/12-804/10002/-1
Gauge: http://www.jegs.com/i/JEGS/555/41040/10002/-1

What is the point of running these? I currently have the MC2150 with electric choke hooked up but she is bogging down and almost stalling under load. I have to push the clutch in to keep her running. and it is sputtering when I accel. I am taking it in to a carb specialist on Wensday, so he can check to make sure it is running right but should I install the regulator and gauge right after?


I know a few people are running these and any help/ advice is greatly heard. I thought about pulling the MC out and switching to a weber but don't know which one to go with. Besides a lot of you are running MC with nothing but great things to say about them.

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Unread 07-14-2009, 05:51 PM   #2
emahan01
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bump also wondering this as i am swaping to motorcraft carb ?
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Unread 07-14-2009, 06:20 PM   #3
ScottsYJ
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I do not have a fuel regulator on mine and have no issues. I know that the webers require them. Searching the forum for info when I did my swap, I did not come across anyone using a fuel regulator with a MC2100.
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Unread 07-14-2009, 06:23 PM   #4
4.7stroker
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If you have kept the fuel return line then NO you do not need a regulator.
If you have disabled the fuel return then YES you need a regulator.

Dwayne
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Unread 07-14-2009, 09:55 PM   #5
scott5star
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not to steal ur thread but i just installed a weber 32/36 and did not install reg properly so i pulled it off. it still runs fine. am i at risk of messing something up over time. its never stalled or had rough idle or anything since the conversion
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Unread 07-15-2009, 06:48 AM   #6
vadslram
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Not sure on your setup but the fuel filter has a bypass/regulator built into it and it works just fine for my 2100/4.2 combo.
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Unread 07-15-2009, 07:12 AM   #7
Mike1084
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I run a MC2150, (fuel return line), with no regulator. No problems. Here is a good link/w pics for a 2100/2150 .pdf carb rebuild doc. http://www.therangerstation.com/tech..._2150_carb.pdf
Fuel pressure regulators all have the same purpose - to maintain a constant fuel pressure above the intake manifold pressure. They are used to regulate and flow of fuel pumped by fuel pumps and maintain a constant pressure into the carb. Excess fuel is restricted and returned to the tank, (via the return line).
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Unread 07-15-2009, 03:50 PM   #8
Matsuno
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I kinda found the answer to this. But Tazman and 4.7 are correct you do not need to run one with the MC2100/ or the 2150. As long as you maintain the fuel return line from the filter. If you go a one to one with the inline filter then you will need a fuel pressure regulator around (3-3.5psi).

Thanks guys.
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Unread 12-26-2014, 10:06 AM   #9
2k2wranglerx
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reviving a really old thread.

i'm having overfueling issues (i think). is there any benefit to not running a return line?
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Unread 12-26-2014, 10:37 AM   #10
Mike Romain
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Quote:
Originally Posted by 2k2wranglerx View Post
reviving a really old thread.

i'm having overfueling issues (i think). is there any benefit to not running a return line?
Nope. The return line is supposed to come off the top of a level filter with the carb line in the center. This way on a hot shutdown, any vapours produced get blown off the top of the filter back to the tank preventing vapour lock.
The filter has a metered hole in the return to hold 5-7 psi at the carb.
I see dirty air filters on the gas tank vents causing issues or blocked vent lines when folks swap carbs mistakenly thinking that charcoal canister is a power eating emissions part. It isn't, it actually helps gas mileage slightly by leaning the high speed mix a little and has an air filter on it's bottom..
To check the vent system out, just run with the gas cap cracked open.
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