Fuel Pump Solution - All Failure Modes
Great Write-up Jeff !
I've been wondering is there anything we can do to the 04-08 pumps without retro-fit a 09+ pump.
Now question, the Walbro Pump, just walk in to a store and like "Yo I need a Walbro 255 lph pump" and thats it? no specific part number or anything?
and will a Bosch do ?
I just re-read your post
So you mean I just need to drill another 1/8" hole around the Fuel return outlet and thats it ? (plus the new pump of course)
I replaced my OE pump about 10-15 K miles ago. so this will saves me from buying another new OE pump huh ?
I've been wondering is there anything we can do to the 04-08 pumps without retro-fit a 09+ pump.
Now question, the Walbro Pump, just walk in to a store and like "Yo I need a Walbro 255 lph pump" and thats it? no specific part number or anything?
and will a Bosch do ?
I just re-read your post
To increase flow through the siphon, just drill the venturi orifice out to 1/8" through the fuel return outlet (you should only do this with the upgraded pump and it MUST be done with the Walbro to avoid blowing open the pop-off valve at all times, reducing flow and cavitation of the pump assembly) and reinstall.
I replaced my OE pump about 10-15 K miles ago. so this will saves me from buying another new OE pump huh ?
Last edited by nycgps; Jun 18, 2009 at 03:58 PM.
#50
Joined: Nov 2007
Posts: 7,521
Likes: 11
From: Caput Mundi
Great Write-up Jeff !
I've been wondering is there anything we can do to the 04-08 pumps without retro-fit a 09+ pump.
Now question, Which Walbo pump fits? There are like tons of Walbo pumps out there. Will a Bosch do ? if so do you uknow the part number ?
And for the siphon mod, exactly where do you drill the holes ?
I replaced my OE pump about 10-15 K miles ago. So I can just take it out, mod it(put new pump and mod the siphon part) and put it back in and it will work like new huh ? (or better)
Will it cause any other issues tho ?
I've been wondering is there anything we can do to the 04-08 pumps without retro-fit a 09+ pump.
Now question, Which Walbo pump fits? There are like tons of Walbo pumps out there. Will a Bosch do ? if so do you uknow the part number ?
And for the siphon mod, exactly where do you drill the holes ?
I replaced my OE pump about 10-15 K miles ago. So I can just take it out, mod it(put new pump and mod the siphon part) and put it back in and it will work like new huh ? (or better)
Will it cause any other issues tho ?
The problem with the stock pump is that the sock is not reusable so make sure to buy a couple of socks while you replace the pump
The bosch 044 won't fit, that's the main reason why i had mine built
after the problems we had with walbro! Anyway for a stock\NA rx8 anything exceeding the 200lph mark will be way more than enough.
A good thing is that many aftermarket\high end fuel pumps work at a higher pressure than the stock one, this capability should ensure a longer life of the unit too. If it can deliver xhundreds lph @ 6\7psi then it can deliver the half with close to no stress
This is because the pumping speed is always the same, only the amount of flow changes if i am not wrong.
#50
Joined: Nov 2007
Posts: 7,521
Likes: 11
From: Caput Mundi
I use an electrical contact cleaner 
The fact is that i have never been able to find a mazda part n° for the '04-08 filter.
Can you confirm the speed\flow thing? i wouldn't like to say stupid things just because i don't know how to say them in english
The fact is that i have never been able to find a mazda part n° for the '04-08 filter.
Can you confirm the speed\flow thing? i wouldn't like to say stupid things just because i don't know how to say them in english
There are DOZENS of different Walbros.
You need to get the one with the correct flow, pressure, inlet, outlet, shape and electrical connector.
AutoZone wont have it.
Flow and pressure are inversely proportional at the same pumping rate.
You need to get the one with the correct flow, pressure, inlet, outlet, shape and electrical connector.
AutoZone wont have it.
Flow and pressure are inversely proportional at the same pumping rate.
700hp mustang... i wouldn't trust my engine to a walbro in that case either. You know that i've been doing some research as well, ending up with a custom pump made. Well, the reason why i didn't simply buy a walbro is because we encountered some problem on the race cars that used them.
Then we swapped to the bosch 044 and finally to the one i had this guys craft. Our race cars are not even rx8s but after a couple of broken walbros we decided to do some research
Anyway a rotary engine is usually thirstier than its piston counter part as i stated, thus requiring more fuel per HP.
Let me know how you find the walbro to be, maybe we were just unlucky!
Then we swapped to the bosch 044 and finally to the one i had this guys craft. Our race cars are not even rx8s but after a couple of broken walbros we decided to do some research
Anyway a rotary engine is usually thirstier than its piston counter part as i stated, thus requiring more fuel per HP.
Let me know how you find the walbro to be, maybe we were just unlucky!
MM, have you looked into the possibility of fitting a bosch unit in there? It's far superior to the walbro you are currently running.
#50
Joined: Nov 2007
Posts: 7,521
Likes: 11
From: Caput Mundi
Registered User
Joined: Jun 2002
Posts: 3,086
Likes: 1
From: Misinformation Director - Evolv Chicago
The 044 is an external tank unit.
Bosch also has the 040 model that is basically the Walbro 255 lph equivalent. One of those models should fit in tank for the RX-8. Just not sure which as I've never tried to source and fit one of them for our application.
Bosch also has the 040 model that is basically the Walbro 255 lph equivalent. One of those models should fit in tank for the RX-8. Just not sure which as I've never tried to source and fit one of them for our application.
Last edited by Red Devil; Jun 18, 2009 at 04:43 PM.
None of the above fit without significant modification to the pump assembly - exactly what I was trying to avoid.
I don't know where the bum-rap that Walbro is getting from you guys came from, other than by second-hand.
I've used Walbros in a bunch of cars with absolutely no failures of any kind.
I do not know anyone personally that has indicated that they have, themselves, seen a failure.
BTW - the Bosch is nearly three times the price of the Walbro, so it is not useful in this comparison.
I don't know where the bum-rap that Walbro is getting from you guys came from, other than by second-hand.
I've used Walbros in a bunch of cars with absolutely no failures of any kind.
I do not know anyone personally that has indicated that they have, themselves, seen a failure.
BTW - the Bosch is nearly three times the price of the Walbro, so it is not useful in this comparison.
Original Turbo 'd Auto !!
Joined: Mar 2004
Posts: 2,136
Likes: 5
From: Surprise, Arizona
Hey Jeff,
I have a Denso 195130-1270 265lph. It's quite a bit bigger than the OEM pump. So what are some knowledgeable peoples input about using this pump?
I know I'd have to modify the basket for it to fit.
For it's design and connections is it worth it?
I have a Denso 195130-1270 265lph. It's quite a bit bigger than the OEM pump. So what are some knowledgeable peoples input about using this pump?
I know I'd have to modify the basket for it to fit.
For it's design and connections is it worth it?
I found on the site that spoke about the fakes you can order the pump here: http://www.fuel-pumps.net/500.html - not sure on what different inlet/outlet adapters you might need. Since I'm installing a turbo I want to upgrade the pumps and fuel injectors soon. I'm very interested on your results and how your car functions with the upgraded pump.
It "works" pretty much the same way the OE pump "works".
The only difference that matters is that the tuning that you may have done with a bad pump must be redone to compensate.
For instance, the entire boosted rage on my calibrations had to be leaned-out about a full AFR point.
However, the actual value is now, more or less, the same as the commanded value.
The only difference that matters is that the tuning that you may have done with a bad pump must be redone to compensate.
For instance, the entire boosted rage on my calibrations had to be leaned-out about a full AFR point.
However, the actual value is now, more or less, the same as the commanded value.
Life begins @ 30 psi
Joined: Mar 2008
Posts: 1,745
Likes: 0
From: Columbia, MD
Great write up Jeff. Is there a prefered vendor you go to for the legitimate pump that matches our car? I haven't started tracking my car yet, but I would want to get this done before I started pushing my car on the track.
http://www.fuel-pumps.net/12products.html
there are a bunch of different 255 l/hr pumps, hard to tell by the pics which one it is
Original Turbo 'd Auto !!
Joined: Mar 2004
Posts: 2,136
Likes: 5
From: Surprise, Arizona
Her is what I found out about the denso 195130-1270 aka 195130-1020
http://www.mkiv.com/techarticles/fue...t_2/index.html
most of the flow and psi specs are near the center and bottom of the page. Also sounds like If i want to run this pump I have I should re-wire the harness due to the current draw.
http://www.mkiv.com/techarticles/fue...t_2/index.html
most of the flow and psi specs are near the center and bottom of the page. Also sounds like If i want to run this pump I have I should re-wire the harness due to the current draw.
