No pun intended. But,

For some aplications. I will give an example on a project my shop did this summer. It was a Nash Metropoitan that Has a 1800cc MGB Motor with a aftermarket Header and intake with a new carb set up.

The stock car used a fuel pressure of 2.0

The New carb Requires 3.5 Pressure.


There is a very good chance that if the fuel pump is rebuilt and the fuel lines are clear and have been checked at the fuel tank. and with a New fuel filter. There is no reason for a blockage.

If the Carb is still NOT filling up the res. with fuel. Than there is a fuel pump problem.

Here is the issue.

Is the pump the Orig. style and number for this motor. Check the parts number. While a pump may look correct. There is Dif. part numbers as the chaft must ride on the crank in that special place. so, some pump have dif. lingth etc..

If that does check out. Than I would say that the pump is to small for your NEW carb.

The Fix.

Find out what Your NEW carb requires for Pressure. Find a service manual for that carb.

You can get a electric pump and a fuel regulator and adjust it as needed.

Using a larger carb will require spark plugs that run hotter to burn the extra fuel. Keep this in mind.


I would not have done what you have as it will snow ball with other needed mods.

I would just replace it with another orig. carb. unless you do want to modify the whole engine.


I don't know what carb you had but, my 49 235 Used a Carter W1

There is one that was just put up on ebay that is a rebuilt unit.

Good luck and feel free to contact us for help. We will try to help where we can.

Poets Seat Auto
Appraisals, Parts, Service
Past: General Motor's Master Technician
Member: Northeast Chevy/GMC Truck Club
Phone Number: 413.774.5856
Collector of: 1951 Army Chevy Burb barn door,53 GMC COE,two 1934 Chevy Truck,1935 Chevy Army Truck.1950 Gmc Suburban clamshell these are just my chevy/gmc trucks.