P38A Starting problem

Afternoon, my black 4.6 with lpg doesn't start without a small whiff of brake cleaner or similar.if you try to start it without it will turn over but not start,the rev counter doesn't indicate anything, with a bit of help from the cleaner it will fire and the rev counter shows a reading.once started it will tick over perfectly.it will not restart when hot,back to no rev counter. I've done the obvious, crank sensor, ECU temp sensor. No crap on the crank sensor, old and new.fuel switch set to petrol,I've even removed the gas loom to the injectors on one bank, the o/s, the n/s is a bit more involved.it never made a difference. Any clean surgestions welcome.
Bit more info,good spark,New fuel pump and plenty of pressure.

How old is the fuel Alan?

Check to see what the coolant temp sensor is reporting..

Mark Piercy said:

How old is the fuel Alan?

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All new mate,dropped the tank to do the pump and wiped the inside of the tank as the old pump was rotten,so plenty of new petrol and being a old'un new fuel filter.

tomcat59alan said:

All new mate,dropped the tank to do the pump and wiped the inside of the tank as the old pump was rotten,so plenty of new petrol and being a old'un new fuel filter.

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ooooh that is down right schitty ....