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What Is Wrong With Walbro Pumps?

Spurdo

By Spurdo,
in Engines & Forced Induction

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RBceffy25 Rising Star

RBceffy25

Posted
Posted

Just thought I would add my two cents.

I put my ceffiro in the shop just after purchasing it to have a genuine walbro fitted, which i saw with my own eyes prior to fitment. The mechanic opened the fuel tank to find a shitload of rust, probably because it sat in a holding yard in japan before i got it. So he soured a replacement tank, flushed the lines, replaced the fuel filter and fit the walbro. It ran fine for about 9 months until The car just didn't start one day after i had just driven it into town. The walbro had packed it in. So i pulled it out, got a lift to the workshop where the work was done. They wired it up to a battery both forward and in reverse and nothing happened so it was sent back to USA for replacement and i used a standard R33 pump for the time. A few weeks later it cam back and the guys from walbro said they hooked it up and ran it just fine with no problems at all. So i took it home and fit it up again, test started the car and it ran fine, shut off the car and packed up my tools then hopped in the car to go for a spin. Turn the key and no buzzing noise, no starting, nothing... and i thought "not again". So again i removed it and reinstalled the 33 pump, drove back to the workshop. Again, they sent it back to Walbro USA and this time, about 3 months later, Walbro apologized for the inconvenience and for supplying a faulty pump and replaced it with a new one. I installed the new one, this time with a 30 amp relay as it wasn't done before by the mechanic and it worked fine for about 6 months before it did the same thing. My brother and I both held one wire each on a battery terminal and the other end with our other hand on the fuel pump to test it in both forward and reverse and we both witnessed nothing happening. So i packed it away and put a Bosch 040 in. Now never had a problem, very happy with it. About two weeks later my bro and i pulled the walbro out again to test it out of curiosity, because of what had happened with the first one and to our absolute astonishment it worked. I will keep it as a spare or ornament.

That is my personal experience with walbro. :D

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Randon_I_Am Veteran

Randon_I_Am

Posted
Posted

They sound like a real lottery. Some people making great power and can't complain (including me) and some just won't touch them...

since I've already bought it and running it, I ain't gonna go switching it out for a bosch. If I got a good one that's up to the task of 300rwkw on e85 then I'm stoked. But I'll always be keeping a very close eye on my wideband when giving it a hard time...

XKLABA Grand Master

XKLABA

Posted
Posted
Mine was legit, 6 years ago before all these fakes appeared on the market 270rwkw, that was show over for my Walbro.

13:1 AFR's. Bosch pump change over, 10:1

So now the Walbro just gets used as a lift pump for my surge tank.

The issue with Walbros is pressure, they are FINE for N/A power applications - as boost climbs, so does pressure, flow rate then drops off.

There are graphs around here and on the net of the various comparo's.

If you intend on running more than 240rwkw and 15psi - get a bosch or a similar jap/other more suited pump.

Otherwise just for the above the Walbro item is a cheap and good solution.

i have walbro in gtr making 290rwkw @19psi and when put walbro pump in and wired it up we had to take fuel out as it went rich straightaway, so how did you run power to the walbro, off stock wiring, how do you know they weren't fakes back then were you there we the fakes were made and released

  • 2 weeks later...
redevil Proficient

redevil

Posted
Posted

Walbro's are a fine pump, deliver more fuel than the Bosch's do. If you talk to an EFI shop they will actually tell you the walbro is better suited to an RB25. Hence why cars making bigger power need to run 2 Bosch's to compensate for the downfall in flow.

I run Walbro's in all my previous cars and have had cars making over 500hp at the treads with no fuel supply issues. I had one in a car for 3 years and sold the car without an issue. As with any brand it is the luck of the draw. You can go buy a $100,000 mercedes and a $10,000 daewoo and you stand the chance that the daewoo will be more reliable. If you google anything you will find people who have had issues with them.

bubba Grand Master

bubba

Posted
Posted
Walbro's are a fine pump, deliver more fuel than the Bosch's do. If you talk to an EFI shop they will actually tell you the walbro is better suited to an RB25. Hence why cars making bigger power need to run 2 Bosch's to compensate for the downfall in flow.

Wut?

1x 044 mounted in tank is good for over 500rwhp..

redevil Proficient

redevil

Posted
Posted (edited)
Wut?

1x 044 mounted in tank is good for over 500rwhp..

Yeah but look at the flow rate as in litres per hour

Bosch Rating: 200 LPH at 72.5 PSI and 13.5 V

Walbro Rating: 255LPH at 40 PSI

So as per all flow rate of most pumps higher the pressure lower the flow

Edit: Specs based on Bosch 040 and Walbro GSS-432

Edited by redevil
The Dan Grand Master

The Dan

Posted
Posted
Actually more than 215l/hr at 72psi if you are running proper wiring/voltage according to their chart...

Yeah and what does the bosch pump flow at the same voltage?

Apples for apples here.

The 200lph on the bosch pump is at 12v and at 5bar

The 255lph on the walbroken is at 12v but at 3bar

put the Walbroken on 5 bar and its 170-180lph at 12v

crank the bosch up to 14v and it'll be closer to 240lph at 5 bar. The Walbro isn't a bad pump but I'd rather have my fuel pumps piss it in rather than just make it over the line

Beer Baron Grand Master

Beer Baron

Posted
Posted

what's wrong with walbro pumps? well they are not direct fit for starters (no bid deal but worth considering if you're paying someone to install it). they flow far less than most people claim (as explained above) since they quote their flow figures at much lower pressures than anyone else. and they are unreliable pieces of rubbish. go to any big tuner and ask where they keep the bucket of dead walbros. every big tuning shop will have a pile of them in the corner somewhere. real, fake, whatever they have a failure rate that is astronomically higher than any other brand of pump I've seen. maybe that's because they are favoured by tight arses who then tend to skimp on other things too (like proper installation) but whatever the reason they fail at an alarming rate.

ever seen a dead nismo pump? I haven't and I've personally used more than half a dozen on my own cars and sold probably 20 more and seen hundreds more. they cost double a walbro but in my eyes they are more than double as good.

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