Fuel Pump Timer? Pump Location?

I successfully changed the fuel pump on my 2001 Ford Ranger 3.0L 126"
wheelbase, flex-fuel truck [1]. But I have some unanswered questions,
and they'll plague me the rest of my life if they remain so.

Is there a fuel pump timer? How does it work, and where is it?

If indeed, the pump is cooled by fuel going *through* the pump, what's
the advantage of placing the pump *in* the tank?

How come Ford has different pumps for different wheelbase trucks that
are the same otherwise? How can the wheelbase, differing by a few
inches, have anything to do with the pump?

[1] The "flex-fuel", meaning can take either methanol+gasoline mix or
straight gas, part is indicated by the 8th character of the VIN, V for
flex-fuel, U for only straight gas. Apparently that detail is needed to
get the correct pump.
--
(||) Nehmo (||)

Here's my opinions:

Fuel pump timing... not sure what you mean by this. If your talking
about the time the fuel pump engages when you turn the key... with the
engine not running... then the answer is the computer is handling that.

I think the main reason for having the pump in the tank... cost.

As for different pumps for basically the same vehicle. The only reason
I could think of is that car manufacturers are always making revisions
to parts... attempting to improve them. The different pump in this case
may be an improved version of a previous pump. Remeber that the
improved version may or may not be backward compatible with previous
versions due to mounting bolts...etc. This is one of the major reasons
that application data is so vast at auto stores.

www.telstar-electronics.com

"timer" not "timing". Actually I asked in a previous thread
http://snipurl.com/ppj3, but I didn't get an answer yet. If the engine
is dies, does the fuel pump stop after a period? If it does, how long
is this period, and does it begin again the next time the ignition
switch is put in the run position?
--
(||) Nehmo (||)

My answer is the same... when the engine is not running... the computer
is the device that runs the pump for a given time limit.

www.telstar-electronics.com

Nehmo wrote:
> "timer" not "timing". Actually I asked in a previous thread
> http://snipurl.com/ppj3, but I didn't get an answer yet. If the engine
> is dies, does the fuel pump stop after a period? If it does, how long
> is this period, and does it begin again the next time the ignition
> switch is put in the run position?
> --
> (||) Nehmo (||)

doesn't the fuel pump "run" according to need, like an ac thermostat,
if there is "no call" for fuel, it doesn't run??

mho
vƒe

In article >,
wrote:

> doesn't the fuel pump "run" according to need, like an ac thermostat,
> if there is "no call" for fuel, it doesn't run??
>
> mho
> vƒe

No.

The pump need engine input to the computer that says the engine is
running, pump away. Otherwise it times out.

Turn your key from off to run and you will hear the pump start up. It
then will shut off. That is how long it takes the computer to time out.

As far as the rest goes, they wanted to make it very complicated and
difficult to replace the fuel pumps solely with the purpose to make the
mechanics that fix them money.

The old external electric and mechanical pumps were too easy for the
average joe to get, get at and fix.

Total planned obsolescence at it's finest.

The new pumps are cooled by the fuel coming back the return line going
into a jacket around them so they can make cheaper pumps and more
complicated seeming systems to 'snow job' the average consumer some
more.

The first generations of external pumps even had brushes you could
replace....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Nehmo wrote:
>
> I successfully changed the fuel pump on my 2001 Ford Ranger 3.0L 126"
> wheelbase, flex-fuel truck [1]. But I have some unanswered questions,
> and they'll plague me the rest of my life if they remain so.
>
> Is there a fuel pump timer? How does it work, and where is it?
>
> If indeed, the pump is cooled by fuel going *through* the pump, what's
> the advantage of placing the pump *in* the tank?
>
> How come Ford has different pumps for different wheelbase trucks that
> are the same otherwise? How can the wheelbase, differing by a few
> inches, have anything to do with the pump?
>
> [1] The "flex-fuel", meaning can take either methanol+gasoline mix or
> straight gas, part is indicated by the 8th character of the VIN, V for
> flex-fuel, U for only straight gas. Apparently that detail is needed to
> get the correct pump.
> --
> (||) Nehmo (||)

aside question,

not to interrupt the poster's original question, but I had to have a
fuel pump installed on a '93 6 cyl. 3.3 chrysler t-c minivan - twice.
600 bucks a pop.

and, another engine same kind, same year model, has never had any fuel
pump problems - why? just curious.

what can cause an electric fuel pump in the gas tank to fail?

mho
vƒe

>double dog dare you, sound familiar?

>to reduce your driving by *-**10%.

> wrote in message
...
aside question,

not to interrupt the poster's original question, but I had to have a
fuel pump installed on a '93 6 cyl. 3.3 chrysler t-c minivan - twice.
600 bucks a pop.

and, another engine same kind, same year model, has never had any fuel
pump problems - why? just curious.

what can cause an electric fuel pump in the gas tank to fail?

mho
vfe

>double dog dare you, sound familiar?

>to reduce your driving by - 10%.

Other than contamination there is the added heat of excessive current when
the pump has to work against a partially clogged fuel filter. Constant
strain equals early failure.

--
Kevin Mouton
Automotive Technology Instructor
"If women don't find you handsome, they should at least find you handy"
Red Green

>Other than contamination there is the >added heat of excessive current
when >the pump has to work against a partially >clogged fuel filter.
>Constant strain equals early failure.
====
10-4, I buy that, but that didn't seem to be the case - either time.
thanks for your comment, I'll watch it.

mho
vƒe