My 83.5 and 84 both will pump for about 1 second, not 3 seconds.
This is from turning the ignition key on only, not cranking.

I think you have a defective pump. Last time I unscrewed the screw
from the T (T is where a fuel pressure tester can be attached)
there was always some fuel squirting out. This was right after the
fuel pump pumped for one second and the ignition switch turned off.
If you unscrew and pump at the same time fuel will shoot out.

If you disconnect the fuel line from where it connects the pump to
the gas tank fuel will flow out from the fuel line. If no fuel
comes out maybe that's why your pump pumped 3 seconds (then give up).

There may be other possibilities. Good luck.

David

--- Don Spence <dkspence@TELUS.NET> wrote:

> 83.5 wbx,
>
> New ignition system, (yes I have spark), fires when I inject fuel
> into intake plenum. Does not fire otherwise. I have replaced the fuel
> filter, fuel pressure regulator (had a spare so why not), cleaned the
> injectors, checked the injector clips with a noid (yes good pulses on
> all four)  and I'm thinking that the pump is defective in it's
> pressure output. ( As in not enough pressure to squirt fuel under
> compression) The pump runs for 3 seconds when the ignition is turned
> on but with either an injector bar hose disconnected or the pressure
> release bolt removed  I get no squirting fuel back at the engine .
>
> Should this "open system" squirt fuel out of either or both of these
> openings?
>
> Is my thinking logical?  How  (sequence) should I check the fuel pump
> function. ( I don't have a pressure gauge though could acquire one if
> necessary.
>    TIA
>   Don ( the frustrated one)
>

____________________________________________________________________________________
It's here! Your new message!
Get new email alerts with the free Yahoo! Toolbar.
http://tools.search.yahoo.com/toolbar/features/mail/