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502 vst problem

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Old 07-12-2015, 09:02 AM
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Default 502 vst problem

I have a gen 5 502 and last week when I turn the key one click u can hear a click at the tank but the pump does not turn on. So I went and bought a brand new pump for it. I went out yesterday and after driving for 45 min it went out again and again will not turn on. I looked over the wiring and it all looks ok, any ideas ? Did I really blow another one? Any thoughts of why this is happening? Thankyou

Last edited by Dmsroxstar; 07-12-2015 at 10:04 AM.
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Old 07-12-2015, 12:53 PM
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Basic VST operation-
Key on, ecm energized, fuel pump relay closes for approx 2 secs or until oil pressure is reached.

I'd be looking at my relay.
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Old 07-12-2015, 05:48 PM
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Agree, check relay. You could also swap the two relays, one is for main power the other is the fuel pump, and they are both the same type. Should be side by side
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Old 07-18-2015, 06:47 AM
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Thanks guys that was it!!
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