Posted 09 November 2019 - 10:02 PM
Situation is I have an mpi tank with a replacement fuel pump that seems to have broken..
Symptoms are inconsistent fuel pressure when engine warmed up...the system feeds an SC 5 port modification...so I need approx 45 psi.. anyway to get to the point..the car was originally a carb version so I needed to plump in wiring for a relay to operate the pump...including an online fuse and fuel cut out switch for safety. I have been told that the fuel pump may have failed as the cables in the wiring to the relay might have been too thin...I suppose meaning that the pump draws more current? Could this be the case? If so what wire gauge should I use? Is 20 amp a reasonable rating for the inline fuse? Any help appreciated.
Posted 10 November 2019 - 12:01 AM
Assuming it's a blade type fuse it should be rated at more than the current drawn by the pump but less than the current carrying capacity of the wiring, typically wiring is rated at double the continuous current rating of the fuse.
It's on page 16
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