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Old 02-24-2016, 12:43 AM   #2 (permalink)
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Freddyack's Avatar
Join Date: Jul 2011
Location: Denver, CO
Posts: 9,491

As far as I know, there is no code for a faulty lift pump.

Check first to see if the lift pump is connected to the lift pump wiring connector.

If you can find this: https://www.dieselplace.com/forum/63-...ml#post6910025, apply 12v and open the water in fuel drain by the thermostat. Make sure to have a container to capture fuel. If you get a steady stream of fuel the lift pump is working.

If the lift pump works, then there is a problem with the lift pump relay or another electrical short.

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