Originally Posted by
Glenn.
Check to see if you have 12 volts at the fuel pump.
Me and blacky did mine a few weekends ago.We took a live from the battery and used the original relay. Then we ran a new wire from the relay to the pump. Just make sure the wire you use can cope with the voltage. We doubled up the wiring to the relay from the battery and to the pump.
But this isn't what the problem is, it's when UNDER load, so you need to check the power whilst giving the car a bootful, ideally you want to see alternator power, but so long as you don't have less than 12V.
The earth also needs checking as with any circuit it's just as important as the live. Don't be tempted to ground on a rusty spare wheel well etc, if you do the whole rewiring job will be in vain.
Martin