GK1707

iTrader: (10)

True that. I thought the DW200 would have been sufficient but apparently it outflowed my stock S1 assembly and I was still having fuel starvation issues under a quarter tank.

I installed the S2 pump, with little to no modifications and no more fuel starvation issues.

dannobre

iTrader: (3)

Go faster...they will come back

TeamRX8

iTrader: (25)

The S2 assembly is still better than the S1 in that regard

AreAxeAte

iTrader: (1)

dannobre, as a moderator do you have the ability to update the first page of this thread? Or what about some sort of pre-post (if this is such a thing)? I'm not that familiar with forum posting rules or moderator abilities. But it would be nice to have a "foreword" post before the original post by MM.

dannobre

iTrader: (3)

It isn't a flow issue..the stock pump will flow enough......the issue is keeping the fuel in the cup so the pump can pump it In this regard putting in a higher flow pump doesn't help...it can actually make things worse depending on what you do with the regulator outflow

GK1707

iTrader: (10)

Yeah that's what I meant. The higher flowing DW pump was emptying the fuel cup quicker actually, or that's what it seemed like bc it started bogging down below a quarter tank and once even cut off on me, with a quarter tank.

logalinipoo

What about a sealed supply tank in the driver side.

Stock pump system in the passenger side will supply the second sealed tank.

The second tank will have a inlet. Then a fuel pump/FPR and it will go out to the engine.


It stays a nonreturn intank system.

GK1707

iTrader: (10)

I read a while back of a few people who track their cars running low pressure pumps in the passenger side saddle to supply the driver side, sounds plausible.

GK1707

iTrader: (10)

Troubleshooting your fuel level sender

This write up^^ helped me understand better how the fuel system actually works on the 8.

A passenger side pump would probably be the best option for those who track and take high G left turns where the fuel is most likely to stay in the passenger side saddle.

dannobre

iTrader: (3)

Just remember on a street car you don't want a pump running in an empty tank

gwilliams6

I have to admit I thought the DW200 pump solution in my Series 1 RX8 would solve my pump issues. In the long run, it did not. I have bitten the bullet and had a new Series 2 pump and assembly installed. Got the parts from Mazmart and had the mods done by longtime master rotary wrench Jim Phillips of JPR Imports in Southern New Jersey. So far the results have been excellent, even at low fuel tank levels. I will keep the forum updated as I go forward.

9krpmrx8

iTrader: (46)

gwilliams6

Some folks had a lasting solution going with DW pumps. My DW200 lasted for about 8000 miles before I experienced similar overheating failure under heavy load. If you look at all the fuel pump threads on this forum, peoples' experiences widely vary. On another thread just today, another RX8 owner had their S2 pump go out after 14000km.

So 9krpmrx8 have your laugh, but realize there is no one solution that seems to fit everyone's car, and their individual driving demands and circumstances.

9krpmrx8

iTrader: (46)

I'm just laughing because Team tried to tell you but you didn't listen, you were the DW defender.

There is one solution, if you have the stock pump don't drive hard when you are low on fuel. I have 143,000 miles on my 8 and I have never had a problem (other than a leaking line) with fuel pressure turbo or NA with the stock pump or with the Walbro in the stock assembly.

In my experience the fuel pump issues are greatly exaggerated on this site. In ten years locally the only fuel pump failures I have seen have been on high mileage units. Of course on track cars there are different needs.

gwilliams6

I have over a million miles driving rotaries so let's not get into mileage ok, and yes I don't drive hard when low on fuel. There are some who have long success with DW pumps, the numbers are there and I know a few personally.

BTW I pm'd two of our esteemed Moderators and even a member-merchant that all have more RX8 experience than me and even you, and they thought the DW pump was a good solution for my particular situation. It worked fine in all driving conditions and pump loads for over 8000 miles across a good part of the whole country.

The fuel pump issues are real, even if you don't think so. And I know personal stories where pump failure in Series 1 have occurred on cars with just moderate mileage. My Mazda dealer (one of the top volume Mazda dealers on the East Coast) had even replaced a few while those Series 1 Rx8s were still under the factory bumper-to-bumper warranty. The S2 pump is just one possible solution to the Series 1's flaw.

9krpmrx8

iTrader: (46)

Replacing a few doesn't equate to a large scale problem on a vehicle with over 200,000 units sold. And being a mod or a merchant here doesn't mean you are an expert at anything, it's just an opinion like everyone elses. Having a high flow pump on a street driven NA RX-8 makes no sense, it's not really debatable.

dannobre

iTrader: (3)

This quote is so full of opinion Laughed my *** off

ASH8

Treading carefully here...

Sorry gw I know of no Series 2 Fuel Pumps failing in a S2 at such a low mileage.
Perhaps the S1 owner did not install S2 FP correctly in their S1.?

S1 FP issues are real (at low fuel levels), otherwise there would not have been an upgrade in the S2.

Has anyone heard of the separate Fuel Pump Resistor failing (same for all RX-8's)?

Brettus

iTrader: (2)

Yes . Someone on here had that recently

9krpmrx8

iTrader: (46)

Mine just failed last month at 143,000 or so. I have seen one other failure but it was also on a high mileage 2004.

Mine just failed from one day to the next. The symptoms on mine were that the car would start, idle for a second, and then die.

ASH8

OK, Thanks..

Yeah, I wondered what the symptoms could have been (particularly with resistors, sometimes they can work, or intermittent, or usually not at all).

BTW: "car would start, idle for a second, and then die", in a diagnostic scenario can also be the PATS (Immo setup)..

9krpmrx8

iTrader: (46)

Yeah mine just went all of the sudden, same for my buddy. I also know that the car won't run if you don't hook up the ground that goes to the lower intake manifold.

gwilliams6

ASH8 I agree with you. Not talking about a S2 pump in an S2. There is a post today about a Series 1 owner who had done an S2 swap who says it only lasted 1400km. Check new posts, it was today. I personally don't know this owner. Don't know if this owner installed it correctly or even if it was a new or used Series 2 pump.

And yes Mazda would not have changed the pump and assembly if there was NOT a problem, exactly.

TeamRX8

iTrader: (25)

Or some people have no idea of either what they're talking about or doing ....




.

Warrior777

iTrader: (11)

So my series 2 fuel pump took a dump today at the track. What are the chances its the removable filter thats clogged? I had to stop like 6 times on the way home. Took me 2.5 hours to drive 95 miles due to symptoms of fuel starvation. I'm trying to decide by tomorrow if i should just order a new one from mazmart or pull the unit and inspect it first.