The claim was to be able to pump out 19 gallons in 1/2 hour through the fuel
pressure port on the fuel rail. It can not be done. The pump on a Crown vic is
rated at 20GPH. To make the claim true you would need to at least double the GPH
and take away the normal restrictions of the fuel system. I did not say you can
not pump fuel from the pressure port, I do it on a regularly. I'll say it again,
it takes on average 7 minutes to fill a 2 gallon fuel container. Do the math.
The claim is bull-shit.
itself that needs replaced??
I'm not always in a hurry to do a job. If it works out, sometimes I'll start
draining the tank on one vehicle while I'm finishing up another job. It does
cut into my bullshit time but I make more money. <G>
That is roughly 68 liters? Been a few years so I'm not 100% sure of
the tank size.
The transfer unit used a roller cell type external EFI pump rated for
something like 350HP or 150 liters per hour at 20 some PSI IIRC.
Emptying the tank through the line was about 30% faster than through
the access valve. Flipping a pair of valves on the unit and dropping
the hose into the filler neck refueled the car in something like 20
Trying to suck the fuel out the access port with the valve installed
I'm talking about doing it in the shop, where safety regulations
REQUIRE a fuel transfer pump/tank unit. I made the unit we used for
about 6 years while I was service manager - and it may still be in use
today. I left the dealership in question about 18 years ago
When i worked at the dodge dealer, the way i removed the intank fuel pumps
was not to drop the tank but raise the bed, the tank can be completly full
and never dropped....remove the 6 15mm. bolts...leave the two back ones in
but loosen them the ground strap and the three screws attaching the fuel
neck to the body comes off, lower the truck with a jack stand under the bed
, the bed goes up while the truck comes down, looks like a dump truck
dropping a load when it is up
Most of the LHS's pump are removed thru the trunk without disassembling the
tank, i think the newer ones have the drain on the tanks, but not sure. and
we were talking about Trucks, i was posting on that...
Well, I suppose this means that you haven't heard about enough
of them then. Even with dropping fuel tanks, most of them are not
nearly as hard as you might think. You are comparing replacing
an electric fuel pump that is "outside" the fuel tank to replacing
one that is inside the fuel tank. I was thinking more along the lines
of the older mechanical fuel pumps that were attached to the engine.
These were far more common on domestic vehicles then inline
external electric fuel pumps.
Many late model vehicles also have access panels in the trunk that
make changing an electric fuel pump a 15 minute job. Most vehicles
that I work on (GM), you can have the fuel tank out in 10 minutes.
Definitely wrong. I changed the in tank fuel pump on my 86 Dodge GLH-T
three times. All I had to do was wait for the fuel level to drop low
enough before I pulled it. I jakced up the right rear of the car and
then pulled off the wheel. Then the fuel pump/sender assembly could be
easily pulled out. Smart design.
Perhaps if your degree was in electrical, rather than mechanical,
engineering you might. One reason is liquids can not burn. By
being inside the tank, there is no possibility of a combustible
mixture or fire. If for example the electric fuel pump were
outside the tank, in the line, there is a much greater
probability of a combustible mixture occurring in the event of a
fuel leak. OK?
Al Smith wrote:
I'm electrical - but sure not interested in taking sides
in this conversation.
I do have one question though that I'd like to ask if
I may? When I have a quarter tank of fuel left, what
exactly occupies the remaining space?
If I see where you're going with this, the inside of the fuel pump
(where all the electrical commutation/sparking takes place) is 100% full
of liquid fuel under all conditions. Missing only one ingredient for
fire or explosion: air/oxygen. Comforting thought, eh?
To answer your question: air (but all the arcing and sparking is inside
the pump with only liquid fuel).
(To reply by e-mail, replace the last letter of the alphabet in my
adddress with the letter 'x')
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