sounds like the circuit opening relay for the fuel pump.
when you turn the key to the on position, the fuel pump runs for a few seconds to prime the lines and fuel rail, then stops. that supplies enough fuel to get the engine to fire and once the VAFM starts seeing a signal that air is coming in, the fuel pump receives power again and begins pumping until that signal ceases.
check that and see if its hooked up. if so and operating properly, then id look at your VAFM/KVAFM
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87 toyota 4x4 single cab short box pickup, 7MGZE.
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