I guess I don't understand how cycling the key will produce more "volume" if
the pressure doesn't change. The fuel pressure made by the pump is what
pushes the fuel through the system. If the pump turns on pressurizes the
rails, and then kicks off, cycling the key isn't going to do much more. It
doesn't pump more volume as it's a closed system. It either has pressure or
it doesn't, if it builds the required pressure than it will supply the
required fuel. And the fuel system on your '92 is a little different than
his 2002. So that's like comparing apples to oranges.
brian cropp
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Ray Block
Sent: Thursday, August 27, 2009 9:35 PM
To: dakota-truck@dakota-truck.net
Subject: DML: RE: RE: Fuel Pump
> -----Original Message-----
> From: Brian
> >
> And how do you know it's a slow start due to that?? When you turn the key
> on, you can hear the pump kick on. No need to cycle the key on and off.
> If
> the pump turns on it build pressure. Cycling the key won't make it build
> up
> any more pressure than the pump can make the first time. <snip>
> brian cropp
Aw geez Brian, I have to disagree. While it's true the pump won't build
any more "pressure" by cycling the key a couple times, it will pump more
volume with each cycle. (each cycle only lasts a few seconds) Depending
upon how much pressure/volume is lost to fuel retuning to the pump during
non-use of the truck, it may take one, two or three cycles to get enough
fuel to the injectors to enable an immediate start upon ignition.
I've been dealing with this for, hmmm, 17 years on my '92. It's had two
fuel pumps and several (on the fuel rail) fuel pressure regulators.
Nothing helped. It works fine if the restart is within a few hours but
after overnight or longer, it will crank quite a while before starting if
you don't cycle the pump first. Depending...it may take one to several
cycles. Do that and it will fire before the starter quits spinning.
Just my experience. Yours, understandably, may differ....but that doesn't
mean mine isn't valid. ;)
Ray
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