Walbro fuel pump DIY

[soxfan143]

Originally Posted by XSRCivic

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:

The reason why it runs fine is because it will reduce pulse width on the injectors to make up for the added pressure. So unless we actually hook up a gauge we will never really know.

[vtecmike1]

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.

how come rsx guys have run on the stock pump with the modified stock injectors at 510cc's for years boosting 7-9psi? is our pump different?

i plan on boosting around 9psi but i already have a crushed fpr so i dont know if the reflash thats going to come with the comptech stage 3 would take into account the walbro pump and a crushed fpr... i think its gonna be designed for a stock pump..

reason i'm asking is do you think i would be better off replacing the crushed fpr to a stock one and using the walbro when stage 3 comes out or leaving the crushed one in and switching to the walbro as well.
thanks.

[Supa Ninja]

I don't know how they do it on a stock pump (i think they upgrade to the walbro too, i read a bunch of DIY on crsx). There are quite a few on here that had their stock pumps begin to fail, I'm one of them.

[vtecmike1]

thats good to know. i'm gonna look into getting the walbro before i upgrade. i'm just confused as to whether or not i could leave my crushed fpr in or have to go back to the stock one if and when comptech comes with with the new stages.

[fa5_4lyfe]

nice job very well said

[Supa Ninja]

My walbro is already failing, I ordered a new one and I'm waiting for it. I suspect it was either a manifature (?) defect or running seafoam that did it in. I ran seafoam before my stock pump ate ****aki too. So I am never running seafoam again. Everyone I have talked to is surprised the walbro failed, they are a very reliable pump. For now new walbro, then in the somewhat near future I'm going to do a return line/ext fpr.

[Willie Mack]

Originally Posted by Supa Ninja

My walbro is already failing, I ordered a new one and I'm waiting for it. I suspect it was either a manifature (?) defect or running seafoam that did it in. I ran seafoam before my stock pump ate ****aki too. So I am never running seafoam again. Everyone I have talked to is surprised the walbro failed, they are a very reliable pump. For now new walbro, then in the somewhat near future I'm going to do a return line/ext fpr.

Dude. Your build is rough. But keep at it, it'll get there.

[Supa Ninja]

If it was easy everyone would be boosted.

[mako8]

The saying's true, Ya gotta pay to play.

[ImAuthenticFTW]

Okay guys i just read the whole thread and i wanna make sure that its fine to run this pump on my set up.
I have full bolt ons (i/h/e) with stock injectors (duh). But i am also running a 75shot of nitrous (will be upping to a 100shot with the pump)

so is it okay to run this pump in my situation?? I mainly want it to make sure im going to have good FP when i spray the 100 shot but from what i read on here it should still be fine when im just daily driving......

[lessthanwise]

seafoam should never go anywhere except your intake passage...

[ImAuthenticFTW]

Originally Posted by ImAuthenticFTW

Okay guys i just read the whole thread and i wanna make sure that its fine to run this pump on my set up.
I have full bolt ons (i/h/e) with stock injectors (duh). But i am also running a 75shot of nitrous (will be upping to a 100shot with the pump)

so is it okay to run this pump in my situation?? I mainly want it to make sure im going to have good FP when i spray the 100 shot but from what i read on here it should still be fine when im just daily driving......

BUMP so can anyone answer this for me?

[Supa Ninja]

I don't know the juice so I have no clue. I would think you would need bigger injectors to take advantage of the extra fuel pressure while your on the spray, but then you would need some kind of management setup.

[soxfan143]

Seafoam should never go anywhere near you car EVER!!!! That **** is so bad for your motor. I witnessed an 04 Mazda truck go up in smoke from that crap. It was one of those Mazda crossover car/trucks. I can't remember the model name but it was kind of funny. It made this horrible snapping noise and it just shut down. The #3 cylinder rod just snapped and seized the motor instantly. The block was split and the entire motor was junk. It needed an entire long block. So use seafoam and ruin your motor. It's just as bad as those fuel system cleaners that you feed into your intake manifold to "clean" your motor. What a scam. Lol...I do those all day at work and they do nothing but increase the risk of blowing your motor to ****. Lol...

[lessthanwise]

I've used water before (via a vacuum to the IM) to de carbon my baby

[ImAuthenticFTW]

Originally Posted by Supa Ninja

I don't know the juice so I have no clue. I would think you would need bigger injectors to take advantage of the extra fuel pressure while your on the spray, but then you would need some kind of management setup.

well i am running a wet shot set up, so the fuel is added when the nitrous is from its own selonoid, basically i dont need new injectirs because they dont add any extra fuel.

so im going to assume its okay to use in my situation, casue my buddy has a Walbro255 for sale for $50 so i think imma go ahead and get it

[soxfan143]

Originally Posted by lessthanwise

I've used water before (via a vacuum to the IM) to de carbon my baby

Good luck with that. I would never do that. As long as you use good fuel and oil and keep your oil clean you should be OK with carbon build up. How many miles on your car? You shouldn't have to clean carbon out of your motor yet. Even if you did have build up it would take years and at least 75K plus miles. At least in my experiences, that's what I found. Cheap no name brand gas is the leading cause of carbon build up.

[lessthanwise]

jdm b16s...

haven't done it on the k20 don't ever plan to

[vtecmike1]

i cleaned the carbon off my old b16 pistons by hand when i had my cylinder head off for machining. lol it took like an hour but my pistons were shiny and new again.

elbow grease ftw! :P

[DatBigDude]

subed.