Walbro fuel pump DIY

[EyCivicDriver]

OK...just read through the previous pages. Still kinda confused. I have a CTeSC sitting in my room, but have not began install. Could I run this pump instead of crushing my FPR? I am wondering because down the road (stage 2, if it ever comes out) I might need this upgrade anyways. Or is it better to just crush the FPR and forget about this? It seems like a better option to go with the pump. Later I could add an aftermarket FPR, etc. It seems like a better idea in the long run? Or not? Input?

[soxfan143]

Originally Posted by EyCivicDriver

OK...just read through the previous pages. Still kinda confused. I have a CTeSC sitting in my room, but have not began install. Could I run this pump instead of crushing my FPR? I am wondering because down the road (stage 2, if it ever comes out) I might need this upgrade anyways. Or is it better to just crush the FPR and forget about this? It seems like a better option to go with the pump. Later I could add an aftermarket FPR, etc. It seems like a better idea in the long run? Or not? Input?

No. Follow the instructions. The CTeSC reflash is designed to run on the crushed FPR not on adding a pump. Plus I don't know exactly how much the pump will actually raise the pressure or how it will effect the reflash operation. So stick with the way it was designed. The FPR is replaceable and removable if you decide to go with an external FPR.

[Radicalblackcivic]

the pump fits snug into the assembly rite? i did change the oring like it said... it didnt seem like it had to replace, just cut the lil rubber thingy. its ok if the pump its snug in the assembly rite guys? thanks

[Supa Ninja]

ya its going to fit real snug, as long as you got the bottom cover to clip back on it should be good to go.

[Grizam303]

i know that towel!

[Radicalblackcivic]

alrite sweet man, its up and whining hehehe

[Supa Ninja]

Originally Posted by Grizam303

i know that towel!

US Army FTW!

[Supa Ninja]

Originally Posted by Radicalblackcivic

alrite sweet man, its up and whining hehehe

Another great success!

[Radicalblackcivic]

thanks man... special thanks to ainoke too hehehe

[Ainokea_Si]

yea i knew you could get the pump on...just take your time, and ripe it apart

[XSRCivic]

Originally Posted by soxfan143

Adding the pump alone WILL raise the pressure in this car. I used the CT-E FPR tool to crush my FPR and I personally talked to CT-E and they told me that no matter what it will NOT raise the pressure more than 10psi. So the Walbro pump alone raised the pressure up the rest of the way. The stock FPR is designed to work with the stock fuel pumps fuel delivery volume. It's kind of like a garden hose nozzle. At the same setting on the nozzle, if you have terrible water pressure it will not spray as hard but with higher pressure it will spray like a bastard. Same principle here. At least that's how my tuner described it to me. If you increase the amount of fuel that the pump can deliver in a certain amount of time why wouldn't the pressure rise? This fuel system is not capable of lowering the pressure below its base setting. So it will be higher with a higher flowing pump. Basic physics here. The car will just decrease injector pulse widths to compensate for the extra fuel. Unless this car has the ability to decrease pump voltage to lower fuel pressure, but I don't think so.

Your fuel pressure went up after the Walbro install because your stock pump maxed out. The Walbro can flow tons more than the stock unit.

The stock pump is like 100 lph, you crushed the FPR and it topped out, couldn't go anymore. You added the Walbro which is now 255 lph and blamo! fuel galore. See why?


Putting a Walbro pump on a STOCK system (no fpr crush) will NOT increase fuel pressure.

[bluek20z3]

Originally Posted by XSRCivic

Your fuel pressure went up after the Walbro install because your stock pump maxed out. The Walbro can flow tons more than the stock unit.

The stock pump is like 100 lph, you crushed the FPR and it topped out, couldn't go anymore. You added the Walbro which is now 255 lph and blamo! fuel galore. See why?


Putting a Walbro pump on a STOCK system (no fpr crush) will NOT increase fuel pressure.

No it won't increase but if soomeone is running "JUICE" it would be ideal for them. They won't have to worry about losing fuel pressure......But for the turbo guys it kinda sucks because you don't have a adjustable FPR to take andvantage of the Walbro, unless you do a return system.

[XSRCivic]

Originally Posted by bluek20z3

No it won't increase but if soomeone is running "JUICE" it would be ideal for them. They won't have to worry about losing fuel pressure......But for the turbo guys it kinda sucks because you don't have a adjustable FPR to take andvantage of the Walbro, unless you do a return system.

Turbo guys could also benefit without going return style. If you increase the injector size then the pump has to work harder to produce the extra fuel needed. No one really know when the stocker gives out so why not replace it with a Walbro anyway? Better safe than sorry.


I think every person going turbo regardless of its a base greddy kit or full blown monster should upgrade the pump.

Remember the stock pump was designed for working with a stock k20z3, not much more.

[mako8]

On the first page, Supa Ninja said he used the stock O-ring, but then someone else said we need a different size one. I have the fuel pump and the tools listed for the install so do I need any other miscellaneous parts then or what?

[bluek20z3]

Originally Posted by XSRCivic

Turbo guys could also benefit without going return style. If you increase the injector size then the pump has to work harder to produce the extra fuel needed. No one really know when the stocker gives out so why not replace it with a Walbro anyway? Better safe than sorry.


I think every person going turbo regardless of its a base greddy kit or full blown monster should upgrade the pump.

Remember the stock pump was designed for working with a stock k20z3, not much more.

Very ture but the stock is good for in my OP no more then 280whp. The CTESC kit use's your stock pump and most N2O guys still use the stock pump intil they go bigger then a 75shot.So in all fairness here yeah the stock pump can flow pretty good but then again you could change it. But it also comes down to what you want out of your car, I am looking to stay all bolt on's and maybe a 75shot so the stock pump should be fine. But for the F I guys like Soxfan........YEAH they need a walbro, to bad they can't take advantage of there upgrade pump because of the stock FPR but hey it did it's job.

[Supa Ninja]

Originally Posted by mako8

On the first page, Supa Ninja said he used the stock O-ring, but then someone else said we need a different size one. I have the fuel pump and the tools listed for the install so do I need any other miscellaneous parts then or what?

I reread the first page, use a oring from the stock injectors and you'll be good to go.

[Supa Ninja]

Originally Posted by bluek20z3

Very ture but the stock is good for in my OP no more then 280whp. The CTESC kit use's your stock pump and most N2O guys still use the stock pump intil they go bigger then a 75shot.So in all fairness here yeah the stock pump can flow pretty good but then again you could change it. But it also comes down to what you want out of your car, I am looking to stay all bolt on's and maybe a 75shot so the stock pump should be fine. But for the F I guys like Soxfan........YEAH they need a walbro, to bad they can't take advantage of there upgrade pump because of the stock FPR but hey it did it's job.

The stock pump is just big enough to run stock injectors, it lasts until you put bigger then 370's. Even with 370's a couple of guys here had pump problems. With nos your not always on the juice so the pump isn't being maxed out for very long periods of time like it is with boost.

[bluek20z3]

Originally Posted by Supa Ninja

The stock pump is just big enough to run stock injectors, it lasts until you put bigger then 370's. Even with 370's a couple of guys here had pump problems. With nos your not always on the juice so the pump isn't being maxed out for very long periods of time like it is with boost.

Very ture^^^^^^^^ You have a point.....I guess then if you have anything like a charger,turbo, or N2O its a good idea to change the pump then....

[soxfan143]

Originally Posted by XSRCivic

Your fuel pressure went up after the Walbro install because your stock pump maxed out. The Walbro can flow tons more than the stock unit.

The stock pump is like 100 lph, you crushed the FPR and it topped out, couldn't go anymore. You added the Walbro which is now 255 lph and blamo! fuel galore. See why?


Putting a Walbro pump on a STOCK system (no fpr crush) will NOT increase fuel pressure.

I did not crush the FPR with the stock pump. Has anyone ever actually added a pressure gauge to their car after installing just the pump? I'm going to swap out a buddies stock FPR and hook up my fuel pressure gauge to the system with just the walbro and see if the pressure rises. My guess is that it will go up. Not by a lot but it will rise. It's simple physics. The extra fuel that is being pumped into the system has to exit somehow. This fuel system is not able to lower pressure below the base setting. I have to wait a bit to test this. I would just go buy a new FPR but they are like $130.00 from Honda.

[XSRCivic]

Originally Posted by soxfan143

I did not crush the FPR with the stock pump. Has anyone ever actually added a pressure gauge to their car after installing just the pump? I'm going to swap out a buddies stock FPR and hook up my fuel pressure gauge to the system with just the walbro and see if the pressure rises. My guess is that it will go up. Not by a lot but it will rise. It's simple physics. The extra fuel that is being pumped into the system has to exit somehow. This fuel system is not able to lower pressure below the base setting. I have to wait a bit to test this. I would just go buy a new FPR but they are like $130.00 from Honda.

The 7thgen civic fuel system was the same as this one. The pump assembly looks different but only the way it sits in the tank. I replaced my stocker with the Walbro during a multi step process to install my return setup.

I had a faulty aeromotive fpr so I had to run just the walbro since the cage for the stocker was modified for the larger walbro.

Whether or not the pressure did rise is debatable because I never tested it with a gauge. Did the car run too rich? Not at all, it drove and operated exactly like stock just with more wine from the tank. I did have a wideband hooked up at the time, there was no dramatic fluctuation in AFR.

Just because it can flow 255 lph doesnt meen it will do that all the time. The stock fpr keeps it in check.

I did run the car before I traded it with no fpr at all and only the walbro. Holy crap the car ran horrible. I couldnt even get it to start and yes i traded it in that way.

7thgen tank assembly:


8thgen tank assembly: