>
> One question which is bothering me concerning pressure in my fuel
> system. The distance between the inline fuel pump and the throttle > body
> where the pressure regulator is located is about 16 feet. The pressure
> sender is located about 6 feet before the pressure regulator. The fuel
> lines are 3/8 inch inside diameter throughout. The fuel is gravity fed
> about 11or 12 inches to the fuel pump which pushes it  to the fuel
> regulator and throttle body, activating the pressure sender on the > way..
> Is the fuel pressure the same at the pump outlet, the sender and the
> regulator? Yvon.
>
> Within a fraction of a psi between the pump and the fuel pressure
> regulator. Is there a return line from the fuel pressure regulator?.
> Sounds like the sender is measuring pump pressure and not injector > pressure.
>
> Paul Lamar ...No rotor no motor.

Yes Paul, forgot to mention that, The return line is from the regulator
direct to the top of the fuel tank. Yvon.

Off topic but related,- I have just suffered a fuel pump failure in my LE Jetronic
system on my BMW K100 motorcycle. Something jammed the rollers in the pump,
it must have been very small because I couldn't detect it. It probably got
past the inlet filter to the pump as the return to the tank tube, which
feeds returned fuel directly into the pump, had come off.
The thing that suprised me was the amount of wear of the commutator,
it was 3mm smaller where the brushes run, the brushes had plenty of length!
The bike has only done 142,000km, say 1500 to 2000 hours. Two sources
were asking $693 = $600US for a replacement!
It would seem unwise to fly without a backup pump in parallel, perhaps
with an automatic changeover when failure occurs.
Has anyone else observed similar wear in a pump?

John Evans

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