what is the purpose of rewireing the fuel pump
#1
Nurse I need 1300cc's NOW
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what is the purpose of rewireing the fuel pump
i bought a walbro for my fc.. it should be here in a few days.. i have been reading about the rewire.. but whats the purpose of this .. i know you have to cut some wires cuz the connectors dont fit up . i have been looking for the how-to on someones site. i havent been able to find it again .. someone please clear this up for me ??
#2
The old wires make it so your fuel pump does not see full voltage under boost. The lower the voltage the less fuel being pumped. New wires = more fuel flow and a healthy engine.
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#9
Jesus is the Messiah
THe pressure regulator regulates the amount of fuel.
You might be overloading it (Causing the car to run rich), but I dont know how much our stock PRs can handle.
You're probably fine
You might be overloading it (Causing the car to run rich), but I dont know how much our stock PRs can handle.
You're probably fine
#13
Jesus is the Messiah
Dude, $60 for a fuel pump is fantastic. Usually fuel pumps dont need any special wiring, and pop right in where the other pops out. I dont know the walbro tho, but it will probably be the same as all the others.
#14
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Originally posted by alwayssideways
i bought a walbro for my fc.. it should be here in a few days.. i have been reading about the rewire.. but whats the purpose of this .. i know you have to cut some wires cuz the connectors dont fit up . i have been looking for the how-to on someones site.
i bought a walbro for my fc.. it should be here in a few days.. i have been reading about the rewire.. but whats the purpose of this .. i know you have to cut some wires cuz the connectors dont fit up . i have been looking for the how-to on someones site.
Originally posted by 13bpower
The old wires make it so your fuel pump does not see full voltage under boost. The lower the voltage the less fuel being pumped. New wires = more fuel flow and a healthy engine.
The old wires make it so your fuel pump does not see full voltage under boost. The lower the voltage the less fuel being pumped. New wires = more fuel flow and a healthy engine.
Originally posted by Tofuball
Is this true of the N/A cars as well? That the pump is getting less then nominal voltage?
Is this true of the N/A cars as well? That the pump is getting less then nominal voltage?
Originally posted by alwayssideways
cuz the fuel pump was rusted up and not working all that well
cuz the fuel pump was rusted up and not working all that well
shouldnt the ecu regulate the amount of fuel???
Originally posted by Tofuball
THe pressure regulator regulates the amount of fuel.
THe pressure regulator regulates the amount of fuel.
#15
Jesus is the Messiah
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
#16
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Originally posted by Tofuball
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
Now you won't be confused about whether or not going from 9volts at the pump vs battery/alternator voltage at the pump will/will not make the fuel rail pressure rise/fall.
#17
Jesus is the Messiah
Ah, I've got an FD fuel pump in right now (It was lying around and my old one went bad, I dont consider this a prefomance mod...) do you think that I'm running richer then before now?
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Originally posted by Tofuball
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
So fuel pressure is kept a fixed amount above manifold pressure, in our case ~37psi higher with a stock pump and FPR. If you put a fuel pressure gauge and manifold prssure gauge next to each other you'd seem the fuel pressure gauge following the manifold pressure gauge's movements almost exactly.
Ah, I've got an FD fuel pump in right now (It was lying around and my old one went bad, I dont consider this a prefomance mod...) do you think that I'm running richer then before now?
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Originally posted by Tofuball
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
Are you sure that the regulator woulnt handle it? As I saw it, the regulator just keept the rail at a certain pressure level, letting anything over that level return to the tank.
#20
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Scott's analogy is a good one. FPR's and wastegates work in a very similar fashion. They attempt to regulate a pressure level by bleeding air or exhaust away. If either are too small, you get too much of what you want. An undersized wastegate gives too much boost and an undersized FPR gives too much fuel pressure.
#21
Jesus is the Messiah
Are there any other adverse side effects other then me just running rich?
When I get my ported intake on with its working aux ports, and finish my exhaust work, I plan to take it to a dyno to get the S-AFC tuned, so that should fix this, but untill then, any idea of a baseline of HOW much I should dial the fuel out? (That was quite the runon)
When I get my ported intake on with its working aux ports, and finish my exhaust work, I plan to take it to a dyno to get the S-AFC tuned, so that should fix this, but untill then, any idea of a baseline of HOW much I should dial the fuel out? (That was quite the runon)
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Originally posted by Tofuball
Are there any other adverse side effects other then me just running rich?
Are there any other adverse side effects other then me just running rich?
When I get my ported intake on with its working aux ports, and finish my exhaust work, I plan to take it to a dyno to get the S-AFC tuned, so that should fix this, but untill then, any idea of a baseline of HOW much I should dial the fuel out?
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