[Saphiro]

I don't know if this will be helpful or not. But, when I bought my C-20 in 2003 the mechanical fuel pump was leaking. So I bought a new one in order to make the 150 mile trip home. Only it suddenly didn't work, at all. The leaking pump worked fine, but the new one didn't. So, as a stop-gap, I bought an electric pump, put it inline and bypassed the mechanical pump. I kid you not, I've been running the truck like that ever since.
I now know that the pushrod for the fuel pump isn't working properly, and has likely worn out all together (or the cam that is). But the electric pump hasn't failed once in the past 12 years. I didn't put in a pressure regulator, and just count on the float valve in the carb to cut off fuel when necessary.