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will only run on lpg


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runs ok on gas,wont start on petrol but tries,runs when switched over from gas,but wont rev,dies when throttle touched,screw on air flow meter has been messed with and screw on throttle body,were do you start,thought it was fuel pump, fitted new one as well as fuel line,is the meant to be 3 relays under drivers seat,there is 2 and one missing,any info really appreciated .

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OK what is it?

What age and engine?

Have a look at the "bible" in the tech archive for fault finding Efi systems.

My 1989 Efi has 3 relays under the drivers seat., one is for the fuel pump.

Can't remember what the others do, and am at least 500 miles away from being able to have a look. :)

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The three relays are:

Fuel pump (will have a white/purple wire coming out of it)

Main relay (lots of brown wires) the ECU won't work without it

Steering module - this is the red plastic one, it contains the parts they forgot to build into the ECU (no, really!) and does a few little things like keeping the fuel pump on whilst cranking. They do go faulty but the component parts inside them are pennies.

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