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Old 09-25-2009, 08:42 PM   #1 (permalink)
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Default Do you still need Fuel Pump re-wire even if u are going 2 use Walbro255

hey guys i just want to get thing clear in my mind before i spend the money and down the road i realize it was a waste.

Do you still have to do a fuel pum re wire even if you are putting high volume pump?

Please let me
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Old 09-27-2009, 01:47 PM   #2 (permalink)
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Then its even more important. The rewire is giving the pump a more reliable supply of power because the stock wires are to small. A higher volume pump could also use the more reliable power supply.

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Old 09-27-2009, 01:48 PM   #3 (permalink)
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^ couldn't have been said better..
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Old 09-27-2009, 02:53 PM   #4 (permalink)
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Stupid question but I am curious anyways. Will the Fuel Pump Rewire cause the injectors to run harder since its getting more voltage with the fuel pump rewire causing more fuel to the injectors... Maybe PCM is not calibrated for this?
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Old 09-27-2009, 06:43 PM   #5 (permalink)
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Quote: Originally Posted by raul-01 View Post
Stupid question but I am curious anyways. Will the Fuel Pump Rewire cause the injectors to run harder since its getting more voltage with the fuel pump rewire causing more fuel to the injectors... Maybe PCM is not calibrated for this?

the fuel pressure regulator will still limit the flow but the pump will get a constant high voltage and #1 run cooler and #2 be able to supply more fuel when its needed (dictated by fuel pressure)

running 2 pumps on 1 leg will show a severe voltage drop making amperage rise this can damage the pump in a short period of time
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Old 09-27-2009, 06:45 PM   #6 (permalink)
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Quote: Originally Posted by nutz View Post
the fuel pressure regulator will still limit the flow but the pump will get a constant high voltage and #1 run cooler and #2 be able to supply more fuel when its needed (dictated by fuel pressure)

running 2 pumps on 1 leg will show a severe voltage drop making amperage rise this can damage the pump in a short period of time

is it safe to run one rewire to two pumps?
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Old 09-27-2009, 06:48 PM   #7 (permalink)
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Quote: Originally Posted by reed32 View Post
is it safe to run one rewire to two pumps?

yes if the relay is rated for the amperage draw of both pumps and the wire must be able to handle the added draw also (everything will need to be beefed up)

you dont want wimpy relays or wires to catch fire
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Old 09-27-2009, 06:50 PM   #8 (permalink)
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Quote: Originally Posted by nutz View Post
yes if the relay is rated for the amperage draw of both pumps and the wire must be able to handle the added draw also (everything will need to be beefed up)

you dont want wimpy relays or wires to catch fire

just debating if i should purchase to another rewire thats all.
this the one i use:


Painless Wiring 50102 - Painless Performance Universal Fuel Pump Relay Kits - Overview - SummitRacing.com
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Old 09-27-2009, 07:15 PM   #9 (permalink)
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I would do 1 relay (big beefy sucka) and some serious wire K.I.S.S.
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Old 09-27-2009, 08:16 PM   #10 (permalink)
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Quote: Originally Posted by nutz View Post
I would do 1 relay (big beefy sucka) and some serious wire K.I.S.S.


Big relay and large wire will do a fine job for 2 pumps. Or you can use a seperate 30 amp fog light relay ($5 from the autoparts store). Run all the wires the same and just split or tap into the original wire just for a signal to turn on the relay. You could run 30 pumps on seperate relays if you wanted to without any negative effects.

Kind of like the Blue (remote on) wire on a car stereo, it just gives a 12v signal and tells the amps to turn on, but doesnt draw hardly any power at all.
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Old 09-27-2009, 11:51 PM   #11 (permalink)
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Quote: Originally Posted by nutz View Post
the fuel pressure regulator will still limit the flow but the pump will get a constant high voltage and #1 run cooler and #2 be able to supply more fuel when its needed (dictated by fuel pressure)

running 2 pumps on 1 leg will show a severe voltage drop making amperage rise this can damage the pump in a short period of time

What? I'm a gen tech and what I was tought you can't have amperage without voltage...If voltage drops so will amperage...
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Old 09-28-2009, 12:24 AM   #12 (permalink)
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Quote: Originally Posted by matthew00029 View Post
What? I'm a gen tech and what I was tought you can't have amperage without voltage...If voltage drops so will amperage...

yea maybe i coulda worded that better , with resistance from thin wires the voltage will drop requiring more amperage to keep the pumps going then poof (i have no idea but i know it will be bad )

Last edited by nutz : 09-28-2009 at 12:57 AM.
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Old 09-28-2009, 01:56 AM   #13 (permalink)
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Quote: Originally Posted by nutz View Post
yea maybe i coulda worded that better , with resistance from thin wires the voltage will drop requiring more amperage to keep the pumps going then poof (i have no idea but i know it will be bad )

Thin wires provide almost no resistance...A bad connection or corrosion will effect voltage not the wire size. Voltage does no work at all, its all amps.
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Old 09-28-2009, 08:14 AM   #14 (permalink)
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Quote: Originally Posted by b3rz3rkACR View Post
hey guys i just want to get thing clear in my mind before i spend the money and down the road i realize it was a waste.

Do you still have to do a fuel pum re wire even if you are putting high volume pump?

Please let me



thx alot guys. no im am clear.
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Old 09-28-2009, 10:49 AM   #15 (permalink)
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Quote: Originally Posted by matthew00029 View Post
Thin wires provide almost no resistance...A bad connection or corrosion will effect voltage not the wire size. Voltage does no work at all, its all amps.

thanx, so thicker wires allow the amount of amps

that makes sence
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