do i have to fill gasolin in the fuelpump before i start the engine?

Hey, I have change´d the coul in my fuelpump,(becorse of easter/holyday all
closedup) the one of them was finish´d
I can´t find any thing about danger on www.
I do trust the people that say that: if no oxygen there is no fire, BUT?
when I put my fuelpump in the tank, there are oxygen! do I have to fill the
pumphouse/canister up with gasolin to ensure that I don´t get the "big
bang"? (Like the Boing 747 flight 800)
I also want to know , were to bye a pump, not the hole house for it, its to
expensive for me. I just want to bye the eletric pump.
I found out , that I can bye one from China, and some are selling Walbro on
ebay.
What di you preffere/ surgest?
hope this can be understand,
sorry my english
Thank You for any response
Regards
J Joergen
Denmark

 

Hi J.

I used to work for a company that manufactured fuel pump parts for
Delphi (GM) and Visteon/Ford. I asked their engineers the same question
about air (oxygen) in the fuel pump. Some of them had not even thought
about it before I asked.

Whatever the explanation, I guess it is not a problem, because you would
certainly be hearing about it on the news if cars were exploding
whenever a fuel pump were replaced.

I can't imagine being the first engineer to propose to management that
"We ought to start building electric fuel pumps with the motor brushes
and commutator actually in the fuel". I can't imagine a legal
department ever taking that risk - no matter how many tests the
engineers did to prove that it was impossible for it to explode.

What year and model of vehicle are you asking about for buying just the
pump without the housing? I assume by "housing", you mean the sending unit?

I just read the shop manual for the LH cars (300M, Intrepid, Concorde,
LHS) on replacing the fuel pump - it gives no precautions or procedures
for ensuring it is filled with fuel before installing and powering up.
Also, the parts listings do not indicate a listing for just the pump.

Be careful buying Chinese aftermarket stuff, and off of ebay in general.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

Hah! No. The brushes and brush holders are exactly what I designed and
that we manufactured for the fuel pumps. Believe me - they are brush
motors. Brushless motors are too expensive for a normal automotive fuel
pump.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

They probably build these pumps with brushless motors.

 

Why don't they make sparks? Or is the motor in a sealed enclosure so it
doesn't matter?

 

Filling the tank with fuel makes it much safer. Fuel vapors displace so
much air that it becomes unable to support combustion. I would recommend
that you put some fuel in, but it does not have to be totally full to become
safe.

 

No - the brushes "live" in the fuel - are bathed in the fuel as it
passes thru the pump.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')