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

FD fuel pump limits?

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Old May 14, 2015 | 12:24 PM
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FD fuel pump limits?

Currently running a FD fuel pump in my T2 swapped FC... putting down roughly 325whp according to my 1/4 mile and MPH calculations, and backed by a very similar FC that put down the near exact time as me.

What are the limits of the pump?
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Old May 14, 2015 | 12:43 PM
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From: https://www2.mazda.com/en/100th/
you have to be pretty close to its limits.
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Old May 15, 2015 | 09:45 AM
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What is the next step up that drops in to the stock location? I dont ever plan on going over 400whp. Supra pump?
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Old May 16, 2015 | 08:41 AM
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There are tons of fuel pumps out there. I have a walbro 255lph. My next plan is the bosch 044. Curious why it seems like you want to stick with a fuel pump of a factory car?

You could also hardwire your existing pump to get power going to it
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Old May 17, 2015 | 08:56 AM
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There seems to be a lot of fake walbro 255's out there.

My current pump does have straight 12v going to it since I'm using a megasquirt ECU.
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Old May 17, 2015 | 05:45 PM
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Originally Posted by j9fd3s
you have to be pretty close to its limits.
My FD pump was on the edge of being able to feed a BONE STOCK 20B, but would stall at idle a few weeks ago, indicating failing fuel pressure. It wasn't enough, so I scored a legitimate Walbro 255 for dirt cheap.

Skip the Supra pump, just go for a Walbro and remember that if it seems too cheap, it's probably a fake one. If all else fails, fire it up on the bench and listen. It will sound very similar to doing a poor man's compression test
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Old May 17, 2015 | 06:09 PM
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The newer Walbros 400lph(90000262 pump gas and 90000267 ethanol friendly) are much quieter and flow better than the previous models
GL Rikk
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Old May 17, 2015 | 10:25 PM
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I'll check it out. thanks guys.
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