Packard Forum Index » Pre-War (1899-1942)

I had my fuel pump rebuilt at Egge machine and it seems like there is to much fuel pressure as gas is pumping out the accerator pump hole in carburetor, the carb was rebuilt, has anyone ever had to put a fuel pressure regulator on? The car is a 1936 120 with a ee-14 carb.

Just FYI. Motors Manual, Eleventh edition has the 35-36 120 pressure out spec at 3 1/2 psi which is 1 psi lower than that given for pumps used on other 36 models and for those pumps used on most models of Packards after 36. I have no experience with Stromberg carbs but Carters and probably even Rochesters can take a slight increase in pressures before the float valve is forced off the seat and starts to leak. To answer your question though, I have not heard of anyone needing a pressure regulator when using a stock and correct mechanical pump.

AFAIK, the only two items that affect pressure out of the type pumps Packard used is the strength of the diaphragm spring and whether the arm was pushed and held in the full travel position during final assembly so that the diaphragm would be kept in its full extended position while the screws holding the two halves of the pump body together were tightened down against the diaphragm rim.

Assuming the spring -- or maybe the whole pump -- didn't get confused with one from another model then that would leave a too tight diaphragm as a possible issue. A problem there will have increased pressure out and if the tension is severe, the diaphragm will either give up weakened from the stress and tears, or if lucky is able to pull enough against the screw holes to get some slippage and working slack. The old fabric reinforced type diaphragms would usually tear somewhere, not sure what newer ethanol resistant construction diaphragms will do.