I recommend a grease or lubricant on the threads. Helps with installation and removal of the pump ring. Teflon tape may suffice, never tried it though.

 

Just did this myself. I'm starting to think maybe different years of RX8 had different connectors for the level sensor on the fuel pump, because mine is white while everyone else's seems to be black. I cut a slot out on the S1 connector and it fit fine, even the connectors that you have to stick in the new connector fit perfectly and are not coming out or loose in any way.

 

Did the swap to the series II pump back in 2015 on my Gen 1 2008 40th Anniversary Edition RX8 and it has worked perfectly ever since. Followed the DIY here in the club with the minor modifications recommended. Cheers

 

Did this swap to my 05. Anyone else level sensor stop going down at aroudn 1/4 of tank. Car sat for a while before i replaced this pump to finish a rebuild.
Used the ford 3/8 - 5/16 kit and im getting gas, I filled it a bit earlier and it read around half a tank.
It doesnt seem like there is a flow issue as after being tuck on 1/4 tank for a while it ran out of gas.

Any suggestions.

 

Check the wiring for theevel sensor...

There is one in the passenger side and one in the drivers side that add up to give the value. If the drivers side one got damaged it won't read correctly on the low end of the fill

 

Would recommend to swap the filter and completely clean hoses before installing if purchasing a used one , the seller used to premix so the filter was dark and worn with 75k on it got one for $125 with the connector I’m impressed how it responds much better considering I also have the S2 tranny

 

Fixed the issue. I needed to trim more off quick connect side of the line. Pump works and getting constant fuel pressure. Now I need to figure out why I keep getting a random high rpm/load misfire

 

noob question. Is the S2 fuel pump basket better than the S1 basket? is that why you guy are swapping the whole assembly over? I was just going to swap in a bigger fuel pump but I would rather get a better basket/assembly as well. Thanks

 

Defenitely better throttle response at high rpm’s doesn’t starve , I’m getting a better cold start in the cold mornings , 6 months still running better than the S1

 

Thanks. I'm not referring to the pump itself. I was asking if the S2 basket has better designed baffling over the S1

 

the s2 basket is better designed and allow more fuel to enter the basket. i was able to run lower fuel level before getting fuel starve on track. i also drilled out the feed hole at the bottom of the basket to allow more fuel in.

 

In one word, yes, it is better, Swap out the entire assembly, as every part is improved over the series one pump. I have seven+ years on my swapped in series two pump on my 2008 40th Anniversary Edition RX8 and it has worked flawlessly, even under high use conditions.

Cheers

 

The parts aren't readily interchangeable between the S1 and S2 fuel pump modules, or at least not without doing a bunch of custom work because they're entirely different designs.

So swapping out the S1 module for the S2 module and making fewer mods to accomplish it is the logical choice.

There's no difference in general running performance though if the pump module is operating properly. The problem on the S1 module is the main filter isn't replaceable, but is on the S2 module. Some people may just swap out the pump and not realize that the filer was plugging up. It was never intended for the S1 pump module to be serviced this way, but they revised that with the S2 module. If you notice a running performance between them other than the low fuel level cornering at high G load scenario then the likely reason is the module was failing.

Here's the S2 pump module thread that details it out: https://www.rx8club.com/series-ii-af...thread-261755/
.

 

Thanks for the information. We race this weekend at Carolina Motorsports Park. And I don’t have time to fix it before then. The next week we race at Sebring. I will make the change before then.

 

When you used this kit did you have any issues with gas gauge reading properly?. And how did you bend you line?
I did this and the line worked for a bit but ended up making it so below 1/8 of the tank I can read my gas Guage and it wasn't sucking properly from the siphon side.


I tried to fix it and it worked for a bit but then jacking up the car from passenger side must of moved it just enough to kink the line or mess something else up. My connecter from the other side is reading properly with the fuel gauge though I will take that side off to check the siphon didn't move at all

​edit: I checked the connector and it was kinked right after the connector. Redid the line a bit to fix the kink. If this doesn't work I'm going to use the extra 5/16 line and get a right angle 3/8 quick connecter as the line shouldn't have to make a u turn to get to the otherside.

 

I had a big advantage... I took the tank off the car.

 

Lol yea I can't /don't want to do that.
though I finally made a proper hose. Just bought a 90 degree 3/8 to 5/16 adapter and used the extra hose from the Ford kit.
Though now I need to replace the level sensor on the driver side. It intermittently works then ***** the bed at 1/8 of a tank.
I had to basically take it out the tank and table test it to figure it out. Cuz it worked properly most of the time.

 

My fuel line coming off the pump crimped itself, and i tried to repair with push-on quick disconnect fitting but the line keeps crushing, despite using a special tool to support the line and using varying amounts of heat and lubricant...

Question: Any reason why i couldn't buy the series 2 rx-8 main fuel supply line (F-189-45-110) and install the whole thing from my series 2 pump up to my fuel rail connection? They appear to roughly run the same pathway.

OEMpartsonline has the hose for about $100 shipped and i am tired to trying to unsuccessfully press fitting on my nylon supply line.

 

For anyone reading this in the future, you need the "Fuel Line Quick Connector 3/8 Bundy Female to Barb Straight for 3/8 Steel to 1/4 Nylon Tubing".
I used a straight connector because I was able to get it shipped overnight. Otherwise, I would have gone with an elbow connector. I'm sure either is fine. I wish someone would have posted the size in this thread already. It would have saved me huge headaches and time wasted re-ordering due to trial and error.

I believe the S2 uses a 5/16 nylon to 3/8 connection at the assembly, while the S1 uses a 1/4 line to 5/16 assembly connection. So that's why you need to go from 1/4 all the way to 3/8.

I know most people struggle with the ring that holds the assembly down, but it's 2025 now, so I simply 3d printed a tool to easily open it. I modified this file (thingiverse.com/thing:5236342) to include a handle and it made taking the ring on and off quite easy. Which is good, because I had to take it off and put it back on four times.

Getting the fuel line hose pushed onto the quick connector was the most difficult part. Eventually I drilled a hole slightly smaller than the hose into a piece of wood, then cut the wood in half and used clamps to clamp them over the hose to hold in place. Then I used a caulk gun to push it in. I got the idea from this video (youtube.com/watch?v=mT8Sne0q_2g). You can also use another clamp instead of the caulk gun.


Safety warning: make sure to securely seal up the gas tank if you need to put this off overnight like I did. I didn't seal mine back up the first time I had to re-order the connector, and roughly two gallons of gas evaporated into my garage, would could have led to an explosion if I didn't have it venting out at ground level. I had to start with half a tank of gas, because the whole reason for the fuel pump install was due the car being unable to rev past 3k if fuel went below 50%.

 

In the link you provided is the wooden attachment and welded metal piece your work? Is that how you modified it? Thanks for the link that is awesome.

 

No, I modified the stl file and printed out a handle with 1/2 torque wrench hole. This is petg at 50% infill. The hole survived taking it off the first time, but got stripped out when putting it back on. I'm not uploading this file, because I would have to change the handle design first. The handle hits the edge of the metal, so I had to re-position it every 1/3 turn or so. If I was making a file to share, I would need to fix that issue first. I didn't really measure the vertical clearances necessary before making it.

 

Could you share the file that you corrected or I would use the uncorrected one as it seems to have worked for you. Also what material did you use to print the tool? I'm getting a Elegoo centauri carbon soon.