Fuel pump pressure for 1990 yj with 4.2L

[eric m]

My google-fu is failing me and I need to determine the fuel pump pressure of the stock mechanical fuel pump on 1990 jeep wrangler with the 4.2L inline six. Swapping on a Weber 32/36 carb and the instructions say it needs 3.5psi don't want to ruin anything if the jeep is pushing 6psi. Thanks.

 

[superj]

your pump does put out higher then the weber required psi. buy a holley regulator that has a dual outlet and just run one line to the carb and the other back to the tank as a return line. i ran my weber like that with zero trouble but i had to put a gage on the line to set the psi down low enough and i think i ended up going to 3.0 for it to not have trouble.

 

[eric m]

Thank you for the info. Off to summits website...

 

[superj]

Yes sir

 

[eric m]

One more question, on the weber there is a fuel bowl vent. The instructions say to hook up same as on the old card. This jeep already has a nutter bypass and the vent on the previous carb was never hooked up. Any ideas?