I have a 73 240 with flat tops. My runs like it is starved fuel. It feels like I am running out of gas if I maintain a high rpm. So, I dropped in some fuel dryier and replaced my fuel filters, then I replaced all my vacume lines and just recently checked my fuel pressure, cause I figured that the pumps couldn't keep the float bowls full and to my suprise the pressure ranged from 4.4 to 4.6psi. At idle and under load. I was wondering at what point too much fuel pressure becomes a problem? I was also wondering if anybody knew what the spec on the fuel volume was?

Thank you for your time,

madsoul

I think about replacing the mechanical fuel pump by an electric one. So I am also interested to know what pressure is needed for the SU carbs in a '72 240 Z

Rolf

I looked in the repair book a few days ago and I think it was 3.4 psi. I don't remember what it was in pascals or what ever the metric measure is but I could look it up if you want me to.

madsoul.

Thank you madsoul

Rolf