Discussion in '1982-Present GM Diesel' started by René, Aug 5, 2002.
Which function has the vacuum switch at the fuel filter?
On my '84 CUCV it's only for the diagnose connector under the dash (according the wiring diagram).
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Is it possible that the part calls itself also Restriction SWITCH?
I <font color="blue">think</font color> that restriction sender should trigger the (change) fuel filter light on the dash. CUCV's didn't have the light but the sender was wired to the STE-ICE connector for diagnosis.
Thus I imagined that. Thats probably only to reminding lazy people of the changing intervals. Before a few days, I have had the pleasure to refuel a dirty fuel. The warning lamp lit up, but the engine ran completely normally. A few minutes after the warning lamp gone out, the engine began too run hardly and had power loss. This play went now so for a long time till I changed the filter. Its probably like that, that I can do without the small lamp
Thanks for the information.
As water builds up in the filter, the flow of fuel will become restricted. I think the pressure switch can turn on the water in fuel light as a backup to the water level detector. Something like that. It's a backup to the water detector. I've heard many stories about the pressure switches going bad and having terrible reliability so people were jsut unplugging them.
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