Walbro 255 fuel pump- WHO RUNS RICH/stock everything

[gotta240]

Who has a walbro 255 fuel pump with mostly everything else stock(ie:no turbo), and is running richer than before?

Theoretically it shouldn't make the car run richer due to the stock FPR. I know this, but i want to hear personal experiences. I did a 20 minute search and read all posts/threads i could find. Seems like most agree that it will not cause a rich situation, however some of the posts disagreed. Want to hear if anyone PERSONALLY experienced a rich situation or a faulty FPR. Thanks.

Reason i'm asking is because i need to pass smog, and debating on installing the F.P. now.

[jrmiller84]

From what I've read, you have to get a new FPR if you decide to upgrade to a Walbro on a KA. But then again, I installed mine with my SR so I can't be too sure.


I thought about installing the Walbro before my swap and that's the problem I remember running into when reading up on it, you'd have to get an aftermarket FPR.

[NI_YON_Zenki]

I have yet to try mine out, Its installed, but I've ran into electrical problems that have taken me to relying on outside assistance. .. .I'll let you know once its comes back out, but I think the replacement of FPR should be considered when upgrading to such a strong after-market unit, there are some univ's on here for sale I've been think'n about investing in, but I'm tired of making purchases for the car & not being able to use the parts yet! shits annoying.

KA's will love any fuel upgrade, period. I quite enjoy the KA over the SR honestly, I can tune it like a 13 blacktop and still push 14 SR capabilities.

can we say: BEST A BOTH WORLDS!

[MadScientist]

I just installed a Tomei/ Nismo 255 L/h in the S14 (still has KA for now)... the car use to stumble a little at idle and didn't start up easy, it also would bog down when you dropped the hammer, and smelled very very rich, before the swap!! The Nismo/ Tomei was a simple swap (other than that damn huge collar)...I did it before the SR because I have alot to do when the SR goes in anyway. I am happy with the results even on the KA... car idles smooth, easy to start, very responsive, doesn't smell like its burning rich anymore!

my .02... BTW the best FPR on the market is SARD!!

Peace
Drew

[Jung918]

I was in the process of turboing my ka on my s13. Started with the walbro and it made it run really rich. It shot the fuel pressure to around 50 psi.

[contranication]

I had a ka with bolt-ons. I installed a walbro and 2 weeks later I had fouled plugs and the whole time I lost like 2miles to the gallon just from driving back and forth to work.

Never got to check if it was the FPR, so I can't comment there but I increased by plug gap by .002" or .02" which ever it is and it gave a long enough spark to keep me from running rich.

[Dream240]

Originally Posted by contranication

I had a ka with bolt-ons. I installed a walbro and 2 weeks later I had fouled plugs and the whole time I lost like 2miles to the gallon just from driving back and forth to work.

Never got to check if it was the FPR, so I can't comment there but I increased by plug gap by .002" or .02" which ever it is and it gave a long enough spark to keep me from running rich.

Well .002 and .02 are a pretty big difference. And chances are you have a faulty FPR. Not sure if it's the fuel pump that causes them to go bad but I've run a Walbro 255 on both my 240s now and neither had a problem with the FPR failing. So it could be just a crapshoot whether it fails or not. I was running a little rich after install, but not enough to cause problems. I upgraded the CAT and passed smog with flying colors, both times.

You have to remember that these cars are anywhere from 10 to 16 years old! Parts break.... it happens. I would install the walbro, then check your mixture if it's running extremely rich then get a new FPR. KAs run a little rich in stock form anyways.

Just check the fuel pressure BEFORE and AFTER install. Your stock readings should be 34 psi(hose connected), and 43 (hose disconnected). If it changes too much after the install then replace it.

[contranication]

Originally Posted by Dream240

Well .002 and .02 are a pretty big difference.

I just can't remember if normal plug gaps are in thousands or hundredths, so I was stating that I increased plug gap by only a very small amount and that worked for me in terms of fouling plugs.

[Dream240]

Originally Posted by contranication

I just can't remember if normal plug gaps are in thousands or hundredths, so I was stating that I increased plug gap by only a very small amount and that worked for me in terms of fouling plugs.

In that case, .002 is the correct adjustment. You standard gap on the KA is .044. So .02 is a rather large adjustment.

Thanks for clearing that up.

DRIVE ON!!