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Troubleshooting a dead fuel pump S70 1998

posted by  B.B. on  Mon Oct 9 11:12 CST 2017
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

No you can't repair relay points !

The points go to hell, and you simply need to buy new ones for abt $25 each.

I'm working from a 1995 850 schematic here:

get the page for Fuel injection 64 for me

The Fuel Pump relay is 2/23

The other Main Fuel relay 2/32 enables +12VDC to the injectors.

Look at the wiring diagram, The pump needs to pump gas,
the injectors need: +12VDC, and the ground side is switched by the CPU
to run them.

Don't get hoodwinked by hearing the pump and assuming it's pumping.
The pump can make noise without pumping...Ask me how I know.
The impeller can disappear or fail to spin, whatever.

BUT, If it's making noise, chances are that the 12V and ground, are there
If it doesn't start AND there's gas at the rail, you can look at the relay
over the radiator. These two relays are legendary for crapping out with old age.
They often get funky before outright quitting.





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