Thanks to all for your responses, but maybe I'm barking up the wrong tree.

My 260e will crank but won't start and I was hoping the OVP may be the cause.

However I did a fuel pressure test yesterday and with KOEO the pressure was 25psi.When i cranked it the pressure went up to around 80-90 psi.but fell almost immediately back to 25psi.with ignition off.Is this right?

My apologies in advance for my limited mechanical knowledge.