Unless the Air Flow Meter (AFM), Cam and Crank sensor senses air flow/movement, it will turn off the fuel pump off after a couple seconds.
Basic fuel pump wireing. The ECU grounds the relay, which turns on the pump. The jumper pin does the same thing. So if the pump runs when jumped, it is not a relay or pump problem (the output of the relay). By default the issue is in the control side of the relay (ECU, Sensors, Wires)
dave
Dave Wheeler
Advanced Autosports, the nations most complete Spec Miata shop
Author, Spec Miata Constructors Guide, version 1 and 2.0
Building Championship winning cars since 1995
4 time Central Division Spec Miata Champion car builder 2012-2013-2014-2017
Back to Back June Sprints Spec Miata 1-2 finishes 2016 and 2017
5 time June Sprints winner in Mazda's
6 Time Northern Conference Champion Car Builder
2014 SCCA Majors National point Champion car builder
2014 SCCA Runoffs winner, T4 (Bender)
2014 Central Division Champion, ITS (Wheeler)
2013 Thunderhill 25 hour winning crew chief
2007 June Sprints winner, (GT1, Mohrhauser)
Over 200 race wins and counting.
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dave@advanced-autosports.com
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