2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Rx7 S4 fuel pump options

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Old Jul 16, 2014 | 10:07 PM
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White Rotary's Avatar
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Rx7 S4 fuel pump options

My FC fuel is on its way out. I am looking for advantage and disadvantage of the below options.

- OEM pump replacement (either used one or a brand new Bosch)
- Walbro 255lph fuel pump

Currently I am running N/A, but I have plan for upgrade in the future. Although I have not had a fixed plan, but it is likely an engine swap. Since I need to get a fuel pump now, I wonder if I should go ahead and buy the Walbro first. According to what I can find online, this pump will be good for 500hp. My end goal is more like 300, so I am debating if I Utilize this chance to upgrade my pump.

By the way, my car has stock fuel system currently, so stock fuel rail, FPR, etc.
I know that Walbro will not give me any gain right now, but should I get it ready for future upgrade. Also, will it has negative draw back if I use the Walbro now?

Please let me know what you guys think.
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Old Jul 16, 2014 | 10:18 PM
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From: tulsa,ok.
Most will tend to tell you that a Walbro is overkill for an NA and will oversupply too much fuel for what is needed.
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Old Jul 17, 2014 | 08:37 AM
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had a walbro 255 on my na s4, I can confirm it is too much pressure for it. I just swapped back to a stock unit and it feels better.

Walbro without an adjustable FPR is going to run pig rich and horrible on fuel economy. My walbro now sits in a bag on my shelf until I rebuild my turbo engine.
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Old Jul 17, 2014 | 09:56 AM
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Originally Posted by archaphil
had a walbro 255 on my na s4, I can confirm it is too much pressure for it. I just swapped back to a stock unit and it feels better.

Walbro without an adjustable FPR is going to run pig rich and horrible on fuel economy. My walbro now sits in a bag on my shelf until I rebuild my turbo engine.
Thanks for sharing your experience.

I will stick with stock pump for now, because I am still saving up for the swap. It would be at least one more year before it can happen.
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Old Jul 17, 2014 | 06:52 PM
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Stay stock the pump swap later on will be the least of your time or money involved with the project
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Old Jul 18, 2014 | 08:23 AM
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Originally Posted by White Rotary
Thanks for sharing your experience.

I will stick with stock pump for now, because I am still saving up for the swap. It would be at least one more year before it can happen.
no problem man. I went the route in which you described. I even have the engine sitting, just no money to rebuild it. haha. Save the money on gas and use it for the walbro and AFPR when you are ready lol.
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