Mk2 k-jet cutting out? Also, no rear fog?

[HuwMk2]

Got a 1987 8v k-jet which cuts out after running for 15 mins or so. Thought the problem was the fuel pump relay so this was changed today. Car fired up and ran for 20 mins before cutting out. The fuse had blown, this was replaced with 30 amp and still blew. Is it a knackered fuel pump? Or could it be some dodgy wiring? Has anybody else had this?

Also, rear fog light doesn't work. Check and the switch is working fine. What could cause this?

[rubjonny]

its either one of the pumps are dead and drawing too much current, or you have a bare wire somewhere that is earthing out!

Check the tank lift pump first, if this is dead the main pump has to work harder to maintain fuel pressure