Tom,
I completely agree that's I called it a stupid statement.
Steve
"Tom Lawrence" <tlawrence5@[EMAIL PROTECTED]
> wrote in message
news:48123333$0$94957$892e0abb@[EMAIL PROTECTED]
>> I got the truck back after the lift pump conversion was complete, bill
>> payed by DC, Very expensive job and a lot of work. I now see 8-9 lbs of
>> pressure at idle and 6-7 under throttle. There was a statement on the
>> conversion paperwork saying that pressure is irrelevant and no
>> aftermarket pressure gauge should be believed and that it is all about
>> flow. Sounds like a pretty stupid comment for them to print. Do you
know
>> the story?
>
> Well, yes and no. While it's true that the test procedure in the
service
> manual for the lift pump is all about measuring fuel flow, and not
> pressure, pressure is still a valid way to verify the health of the lift
> pump. The CP3 injection pump isn't nearly as sensitive to fuel pressure
> as the VP44 was, and will still operate safely at near-zero fuel
pressure
> (so long as there's fuel flow). But, barring any kind of abnormal (and
> unlikely) restriction, you can safely assume that the CP3 is being fed a
> constant supply of fuel so long as your FP gauge registers some amount
of
> pressure.
>
> So, to me, an FP gauge is still plenty valid, and much cheaper than a
flow
> gauge.
>
>
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