YFA Carb Leak

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Jun 6, 2011 | 02:40 PM

bigblacktruck2011

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YFA Carb Leak

I've been on here before and had great success. I've gotten some really great help from other members with my 4.9L inline 6 in the past. Here is my latest problem:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com

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The Carter YFA carb is leaking gas like a water fountian. I don’t know why though. the only thing I can think of is I'm not using the mechanical fuel pump. I bought a Spectra Premium electric fuel pump with 5-9 PSI, 30 GPH, which is the same specs as the mechanical pump. Is there something I’m overlooking on the carb that might be the culprit? The carb is new (rebuilt) and no blockages, corrosion. I do know that when I put the engine under load, the leaking stops. It also seems to be running really rich. Anything else I can add to help solve this problem let me know.

P.S. I'll have photos up later.

Jun 6, 2011 | 02:53 PM

1986F150six

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From: Sheffield, AL

My first thought is: was the electric fuel pump being used successfully before the rebuilt carburetor was installed or were they installed at the same time?

Jun 6, 2011 | 03:07 PM

bigblacktruck2011

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Yes, both components were installed at the same time.

Jun 6, 2011 | 03:20 PM

1986F150six

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From: Sheffield, AL

Then, it could be either one, but my guess is the carburetor. Yes, I read it is newly rebuilt, but sometimes things are bad out of the box. It runs better after being under a load because it has used the "extra" fuel. Try taking a screwdriver with a hard plastic handle and tapping [not too hard] the handle against the base of the carburetor. Hopefully, the float is sticking and this will dislodge it.

Jun 6, 2011 | 04:22 PM

AbandonedBronco

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From: Boise, Idaho

Another option you might try is picking up an in-line fuel pressure gauge. I think Schucks or Napa has them for around $15 - $20. It'd let you know if the pump is putting out too much.

Jun 11, 2011 | 12:22 PM

old409

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Joined: Dec 2010

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From: Harrisburg, PA.

There's a channel in the carb housing where the pump lifter link fits. This channel is open all the way to the bottom of the carb housing and when the fuel level in the housing gets too high it will flow out of the carb through this channel and come out at the carb base and onto the manifold.

You may want to check your float level settings. It's real easy to mess up the float level sttings when putting the carb together.