Efi fuse still blows after changing fuel pump
Correct pump for the truck?
A blown fuse means there is too much current draw from the pump.
Why is the tough question.Pinched wire?
If the fuse does not blow,immediately,can you measure the current draw at the pump in put wire?
Be SURE to cycle the key on for 5 seconds,off for 2 and back on for 5 seconds 3 times! Prime the pump.
If not primed,properly the new pump may burn out.
Sorry.
SOURCE: Will Not Start
It will not run without that fuse intact. There is a short in the circuit that must be fixed .
SOURCE: keeps blowing 15a efi fuse 1991 toyota pickup 2.2 re
there's a short somewhere causing that amperage to go up
SOURCE: my 1991 toyota 4runner keeps blowing the efi fuse
Check the EFI main relay, the circuit opening relay, and the fuel pump relay. Inside the fuel pump relay there is a switch controlled by a coil. During start, the fuel pump gets full power for a couple of seconds to build up pressure. Once pressure is good, the fuel pump relay is supposed to switch (via the coil) the fuel pump to reduced power. If the coil in the relay is bad, the reduced power setting is not available and the fuel pump will run at full power all the time. At this heavy current draw, it won't be long until the EFI fuse blows. This would also give more pressure than is necessary to the cold start fuel injector which runs on a timer. This extra pressure during the time that the cold start injector is operating may be the reason the engine is flooding with fuel.
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