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post #1 of (permalink) Old 05-08-2005, 04:19 PM
Chris_442
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MC 2100 and Fuel Pressure Regulator

I have a 90 4.2 with a Holley rebuilt 2100 with # 48 jets. Does anyone know what the fuel prssure should be and do I need a regulator. On start up I seems to dump a lot of fuel and when its been running for a while sometimes floods out trying to start.

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post #2 of (permalink) Old 05-08-2005, 10:39 PM
 
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Re: MC 2100 and Fuel Pressure Regulator

It's not a fuel pressure problem- it sounds like the spring holding the float isn't locked down, or the float is too high. Or maybe the jets are too big. I have no clue how big "#48" jets are.... Still, you can get an in-line fuel-pressure regulator at NAPA. Put it after the fuel filter and as close to the carb as possible.

Also- what's a Holley 2100? I've heard of a Motorcraft 2100 but never a Holley.
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post #3 of (permalink) Old 05-08-2005, 10:49 PM
 
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Re: MC 2100 and Fuel Pressure Regulator

#47 jets work fine on a 258 with a Motorcraft 2100. That should be close enough. You shouldn't need a fuel pressure regulator with a stock mechanical pump.

Check the power valve to make sure its not stuck or ruptured. Its under the cover at the front bottom. Remove it and make sure the diaphragm isnt ruptured. If there is fuel in the cover, its ruptured. You can put the valve to your lips if you dare to see if it leaks air and if it moves freely from vacuum. A problem with either the needle and float or power valve could cause improper amounts of fuel to enter the mixture.
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post #4 of (permalink) Old 05-08-2005, 10:49 PM
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Re: MC 2100 and Fuel Pressure Regulator

Do you have the 2 outlet fuel filter and the return line still? If not, that is your problem.
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