DIY: Installing Series II Fuel Pump in Series I - Page 5 - RX8Club.com



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Old 03-12-2018, 04:51 PM   #101  
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Originally Posted by RotaryMachineRx View Post
I don't believe it matters, everything should be the same size but since you are installing the S2 assembly I'd go with the S2 for assurance. Are you talking about the o-ring on pump motor or the o-ring around the pump assembly where it sits on top of the fuel tank?
Hi, I'm talking about the latter.
Thank you in advance


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Old 04-24-2018, 11:03 PM   #102  
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Hi everyone !

What if i change the whole fuel tank form a series 2 (together with s2 fuel assembly and pump) and remove the s1 fuel tank with everything.

It should be completely plug and play in this case?
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Old 04-24-2018, 11:50 PM   #103  
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Originally Posted by dirtyDEE View Post
Hi everyone !

What if i change the whole fuel tank form a series 2 (together with s2 fuel assembly and pump) and remove the s1 fuel tank with everything.

It should be completely plug and play in this case?
Yes you 'should' be OK after a quick check of OEM Part Number changes.

As we know the S2 Fuel Tank is slightly larger in fuel capacity and this was achieved by making the overall tank deeper (larger) by about 11 mm (memory), so the mounting Tank Straps are also different to cater for larger Tank.
All the fuel inputs like Fuel Cover and main supply (hose) appears to be the same/OK.
The Fuel Cut off Solenoids and equipment appears to be slightly different as are the OEM Part Numbers.
So as far as I can see provided you install a 'complete Fuel Tank" you should be OK.
You may see some slight differences with Wiring Loom PLUGS.
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Old 04-25-2018, 12:49 PM   #104  
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You would still need to modify the wire loom for the fuel pump as mentioned in this DIY. Why would you replace all this in the first place though, what is the benefit?
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Old 04-25-2018, 07:32 PM   #105  
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The benefit is the correct reading of level sensors? since I have a s2 Dash coming with the fuel tank.

and not so much playing around with stuff inside the fuel tank. Leave everything how it was designed.

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Old 04-25-2018, 11:14 PM   #106  
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Originally Posted by dirtyDEE View Post
Hi everyone !

What if i change the whole fuel tank form a series 2 (together with s2 fuel assembly and pump) and remove the s1 fuel tank with everything.

It should be completely plug and play in this case?
Removing the tank is a MAJOR PITA, IIRC... and when I did it, the car was on a lift. Consider what it takes before choosing this route: PPF, exhaust, driveshaft, ...
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Old 05-15-2018, 12:18 AM   #107  
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Just wanted to say thanks for everyone's input and info on this thread. Did the swap recently. Stayed with the S1 tank, and put the S2 sensor unit left side, like in one of the posts here, using a s2 dash board as well with this setup.

Just i would like to add to make things clear for future readers that the cutting and splicing of the wires and connectors is actually for the fuel level sensors, not the fuel pump.
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Old 05-24-2018, 04:09 PM   #108  
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Just accomplished this myself. Was expecting a protracted fight. Took my time and only spent about an hour.

I used a cut off disc on a rotary tool to trim the blank/unpinned part of the connector for the passenger side level sensor. I left enough material behind that it is securely wedged in there.

My fuel pump ring was only mildly annoying using the $20 tool from amazon. The only real issue is that it interferes with the sheet metal after about 10-15 degrees of rotation so I had to move, reset, repeat.

Idle fuel pressure (according to my fabricobbled Arduino gauge) jumped 5 psi and my idle fuel trims dropped from +8% to +1%-ish.

And now, since my old S1 pump still mostly works, I have a spare to give away at track events for limp-home use.
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Old 05-24-2018, 05:00 PM   #109  
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If anyone needs an S2 pump with 9000 miles on it let me know. It is missing the spring on the bucket though, I have no clue where it went.
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DIY: Installing Series II Fuel Pump in Series I-imag2523.jpg   DIY: Installing Series II Fuel Pump in Series I-imag2524.jpg   DIY: Installing Series II Fuel Pump in Series I-imag2525.jpg  

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