Fuel pressure for 330 GTC

You want a 3-4.5 psi pump. This is a "normal" occurrence with these cars and today's fuels. The best way to deal with this is to think ahead and as your see heavy stop-and-go traffic ahead, turn on the electric pump so it can get a head start on the situation. Tom's solution is also a good option for those that don't mind altering the original system.

 

When was the last time the entire fuel delivery system (filters, hoses, tanks, etc.) got thoroughly serviced ? If more than 10 years ago, now might be a good time to do it.

I currently sorting all that on a Daytona that has been driven less than 14K miles since new, +/-1000 miles in past 15 years and even sitting in a climate controlled SoCal private collection, lack of exercise and over-extended maintenance/service intervals had wreaked havoc on all of it.

 

I also run two pumps in parallel. I use the facet solid state pump with lower range (I think up to 5 psi) and the original. I can have either running. You can rebuild the original one. If the membran itself is ok but the pump stoped working it is very probably the contact mechanism under the cap at the top of the pump. Clean it, especially contact surfaces, and try to adjust so that you get it running without fault. I used a bench setup to test it and had it running about an hour before installation. There is a kind of flat spring which needs to be ok for the plunger to work right. My english knowledge of the special terms is not sufficient enough to describe it better. You will find posts on the fispa pump here as well as on Tom Y. site.

 

Jim: Another item that will help your situation is to add Marvel Oil to your fuel at the recommended dose of 4 oz/10 gal. Fuel today is very "dry" and the Marvel oil adds lubricity to help the valves in the pumps seal. The fuels in the 1950-60s, especially in Europe, was quite "oily" and this added lubricant provided a "seal" for the valves in the fuel pumps. We have done this for many years and find the pumps work noticeably better.

 

dyke, will adding marvel oil to the fuel possibly cause plug fouling? any adjustments required?

 

Ed; No, no effect on plugs. The amount is so small percentage wise that the mixture is unaffected. Never had to make any carburetor adjustments. In 1957, Maserati encountered fuel pump problems, just like we are discussing, at Sebring. They eventually determined it was the Amoco unleaded (yes, unleaded) fuel. Amoco was the race sponsor and everybody had to use their fuel. Maserati started adding a quart of motor oil to every 40 gal tank and the pump problems stopped.

 

How about using modern two-Stroke (API TC) oil as an add on in fuel (about 1%). I heard only good about this in relation to K Jetronic systems and fuel system components?