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For Spook-I goofed 900 1993

posted by  B.B. on  Wed Jul 14 17:54 CST 2021
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Hi Spook,

I was wrong about the 940 fuel relay 2-31. The 850 does the job of powering
the fuel pump with triacs and I think of it more as a power supply than a relay. Volvo calls it a fuel pump controller.

Now I find the 940 fuel pump relay is a pair of relays in one box.
I think the computer cycles power to vary the output of the pump to meet engine demand and not overdrive the pump to shorten its life. So 2-31 the fuel relay gets beat up from heavy use. It probably needs to be changed as a function of miles just like a T-belt. A new KAE fuel controller in the 850 crapped out with less than 2K miles! So maybe the controller is designed to be robust with a healthy fuel pump and heats up if the fuel pump gets worn?

I wish we could gab on private email or the phone. Some of the Brickboard heavy hitters here are bashful. Maybe they're in the witness protection program and have gangsters after them? :-)

Anyway, Thanks for the nice write-up about the 940 shifter knob, that helped me out today. Keep up the great work! Maybe put a disposable email link up in your profile?

Best regards, Bill





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