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Unread 06-14-2008, 07:36 PM   #1
jschroder
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1988 YJ Wrangler 
 
Join Date: Oct 2007
Location: Phoenix
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Motorcraft 2100

Anybody with this carb running a fuel pressure regulator?

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Unread 06-14-2008, 07:45 PM   #2
yjcrawlr
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1990 YJ Wrangler 
 
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I don't run one, I run a 3-5gpm external electric fuel pump with a return fuel line to the fuel cell. Works better than any carb I have run.
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Unread 06-14-2008, 10:04 PM   #3
4.7stroker
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Not here, I kept the return system and everything is great.

Dwayne
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Unread 06-15-2008, 10:03 AM   #4
jschroder
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I'm curious because after my install if I slowly accelerate it is just fine but if I hammer it, it hesitates for a second. It's almost like it's getting too much fuel and flooding. I've tried changing the timing to see if that helps and also adjusted the jets but it keeps doing the same thing. My next step is to try a regulator unless somebody else has had this same issue.
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Unread 06-15-2008, 01:49 PM   #5
4.7stroker
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I woult lean towards adjusting the accelerator pump.
The hesitation could be from not enough fuel to too much fuel from the pump.
Change it from where it is now to a slower fuel delivery to see if that helps.
If not go the other way.

Dwayne
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Unread 06-15-2008, 02:58 PM   #6
jschroder
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Location: Phoenix
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Thanks! I'll try that next.
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Unread 06-16-2008, 08:14 PM   #7
jschroder
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No adjustment seems to make a difference. I'm wondering now if maybe the jets that were put in are too big because it's acting like it's flooding until I get about 1/2 way into the throttle after each shift.

I will say that I never knew that 4.2 was so powerful until I got rid of that Carter, put on the Motorcraft and nuttered it. What a difference!
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Unread 06-16-2008, 09:10 PM   #8
4.7stroker
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I am running #47 jets here @5500'
I still think it is a tuning issue and probably not your jets.
You would be rich all of the time if it were the jets.
Is your power valve working?
With the motor off and you open the throttle all the way do you get a stream shooting down each bore?
Is your vac advance advancing as the rpm's increase? It is so easy to chose the wrong source when swapping carbs.

Dwayne
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