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how do I test a fuel pump relay 700 1989

posted by  lucid on  Wed Sep 25 07:42 CST 2013
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last visit: Fri Oct 24 12:31 CST 2014
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There are 2 FI relays "behind the ashtray" (System and Pump), and since in normal Key ON operation the System relay instantly picks the Pump relay, I don't think you could identify a Pump relay failure just by the sound.
• If Pump relay fails = System relay clicks (click sounds normal)
• If System relay fails = No relay click at all (rare but possible, and the pump won't run)

A better test would have a helper at the back listen for pump sound with the gas cap off, while you turn the key on and off a few times.


--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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New how do I test a fuel pump relay [700][1989]
posted by  c-fut  on Tue Sep 24 22:28 CST 2013 >


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