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Old 11-06-2011, 09:18 AM   #1 (permalink)
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1987 4.2L Fuel Supply Question

I have a 87' YJ w/ the 4.2L in it. I'm also running a Webber carb.

It doesn't seem to be getting enough fuel (have a fuel pressure gauge at the carb - at best it reads 2 psi). If I clamp off the fuel return line, I get more than enough fuel pressure. I have a fuel pressure regulator, so I can dial it to what the Webber carb wants (3 - 3.5 psi).

So, my question is, do I need the fuel return line?? What benefit does it serve?? Am I going to run into issues in the future if I just block it off and run a regular inline fuel filter??
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Old 11-06-2011, 05:09 PM   #2 (permalink)
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My CJ's 4.2 with an mc2100 has an inline filter and no return line. Works just fine.
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Old 11-06-2011, 05:33 PM   #3 (permalink)
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Sounds good ... looks like I'll be messing with the fuel lines this week ... Never ending project!
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Old 11-06-2011, 05:38 PM   #4 (permalink)
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I never ran a fuel return line when i had a Weber on the old 4.2, Regulator at 3psi and it ran great.
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