Re: Proper psi at carburator

Posted by Fred Puhn On 2011/5/4 9:37:27

This is a subject I have had lots of (bad) experience with.

These cheap chrome regulators were put on 3 of my cars and I had fuel feed problems with all three of them. When I took them off the cars ran fine. I am using an adjustable pressure regulator on my vintage race car, but it costs 3 times what the cheap junk ones cost. The expensive one works.

The electric pump may be the wrong one. I had a "professional" put a rotary electric pump on my motor home that was suffering from vapor lock. Later when a real professional took a look at the vehicle he found it was a high pressure boost pump made for modern fuel injected cars and was delivering way too much pressure. You might check the electric pump with a fuel pressure gage on the outlet

I also have experienced the fuel blockage on a rubber hose that replaced the factory flex hose. The hose was bent to a tight radius which eventually became a restriction. The factory flex hose is better reinforced with a braid and will not collapse as easily as a rubber fuel hose.

I have also experienced problems with a fuel tank that was cleaned out and sealed with some high priced "goop". The sealant plugged up the factory filter on the inlet to the fuel line inside the tank. No fuel would come out of the tank and there was no way to fix the totally sealed up filter. I had to toss the tank and start over. This was not a Packard so I am not sure if that could be a problem on your car.

A fuel pressure gage at the inlet to the carburetor will help you sort out these fuel feed problems.