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Sudden Fuel Problem - New Pump, Good Relay 850 1994

There's three fuel system relays, any of which can kill the fuel supply.

Two of the relays are in the main fuse block:

Marked "103", 2/23 is the fuel pump relay that switches +12VDC from Fuse 2 to run the fuel pump

marked "106", 2/31 is the overload relay that switches power to Fuse 2 via the ignition switch

These two relays enable the fuel pump, both have to work and fuse 2 needs to be good.

The third relay, 2/32 is located above the radiator and is called the main fuel relay, and it's function is to enable/disable the injectors.
(It doesn't run the fuel pump.) When it quits the injectors quit.
It's a safety item.

If you don't hear the fuel pump, then focus on the pair of relays in the main fuse block and F2 needs to have 12 volts. Continuity checks for relay points
wont confirm that the old worn points can supply enough amperage to run the fuel pump. Use your multimeter to check DC voltages.

Thus measure Fuse 2 when the ignition is on and power should be at the fuel pump.
You should see +12VDC between Fuse 2 and any ground terminal.
You should see +12VDC at the two pole fuel pump connector in the trunk.

Bill







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New Sudden Fuel Problem - New Pump, Good Relay [850][1994]
posted by  RepairmanJackal subscriber  on Fri Feb 21 15:36 CST 2014 >


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