Re: Stalling problems -- what's more likely to fail -- fuel pump relayor fuel pump
> I've been chasing this around in circles. I've replaced the cam
> position sensor on my 1993 850, and still keep stalling. Four
> non-starts after short trips plus two died-on-road.
> The last non-restart had me trying to listen for the sound of the fuel
> pump going. Ever tried that at a busy gas station and you're the only
> person in the car.
> In my attempts at the last one, I found that I got a trickle of fuel
> for some start attempts. Just enough to have the engine turn over at
> idle but it would die instantly when I touched the gas pedal. Engine
> was running just a touch ragged but not excessively so.
> The guys at the shop are talking fuel pump, but I'm thinking relay
> first because everyone here who has been having similar problems on
> their 1990's 850 and 960 cars have been commenting that the relay goes
> more than the fuel pump.
> Also, the books that I have do not show where the 850 fuel pump relay
> is located.
> Is it in the box along with the fuses but hidden up against the dash
> Thanks muchly.....
The trickle of fuel is a clue, if the pump is working up to spec fuel
should shoot out.
According to my data book, fuel pump spec is 103-160 liters/hour at 13V,
87-145 at 12V and 70-128 at 11V.
If your pump is nowhere near this, I'd change it first.
The 93 is a bit of an oddball, in that it has an older fuel system than
94 and newer. The following applies to 94 and newer, but should mostly
apply to your '93.
The fuel pump relay hides under the cover beside the main fuse box,
There is also a main relay, mounted above the rad, beside the fan
relay. It's usually gray, 4 round pins.
If you want to check the relays, splice a test bulb between the
following wires and ground:
fuel pump relay - red wire over the cover over the fuel tank sending
unit in the trunk
main relay - green wire at the relay
Thornhill (near Toronto), Ont.
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