Sounds like the pump is pumping, but not putting out sufficient
pressure.

The pump is supposed to put out surprisingly high pressure.

I would suspect the pump, and to test it, substitute the known good
pump for the suspect one and see if it works.

If it works: voila', bad fuel pump.

I swapped the pump/check valve/regulator assembly from a car that runs
and had plenty of pressure. I'm want to know how to tell which one of
the three components is bad.


zencraps@comcast.net wrote:
> Sounds like the pump is pumping, but not putting out sufficient
> pressure.
>
> The pump is supposed to put out surprisingly high pressure.
>
> I would suspect the pump, and to test it, substitute the known good
> pump for the suspect one and see if it works.
>
> If it works: voila', bad fuel pump.

Weldman wrote:
>
> I swapped the pump/check valve/regulator assembly from a car that runs
> and had plenty of pressure. I'm want to know how to tell which one of
> the three components is bad.
>

If fuel comes out the accumulator when the line up to the engine is
disconnected
And if a different pump/valve/accumulator combo will pump fuel through
the existing line
Then the original pump is very weak - the difference is it will pump at
zero pressure (disconnected) but when connected there's a regulator in
the fuel distributor that holds pressure at 65 psi - a pressure that
your original pump can no longer generate.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

Weldman wrote:
> I swapped the pump/check valve/regulator assembly from a car that runs
> and had plenty of pressure. I'm want to know how to tell which one of
> the three components is bad.
>




Almost certainly the pump, the CIS pump produces around 80 psi, there's
an internal overpressure release valve but I don't think you can get to
it to repair it.