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Old 05-16-2012, 02:36 PM   #1
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Default Fuel pump selection

Before the motor swap got underway, I was having what I suspect to be fuel pump issues. I swapped injectors, replaced the fuel filter and still had the same problems. The issue was I was having to add base fuel just to get the thing to idle right, and over about 3k rpms, the AFR's would fall on their face and the car would stutter like it had no fuel. With that in mind, I'm swapping the fuel pump as part of my rebuild.

Car is a 91, will be a 2.0 NA motor (for some time to come). Obviously, I don't need a 255 but the DW200 is a competitive price to the walbro 190. Any reason to roll with one over the other? Is there an OE or equiv that will do the job? Most OE pieces I see are crazy expensive compared to the aforementioned offerings. Which has a better service life/history?

-Greer
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Old 05-16-2012, 02:44 PM   #2
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The DW is a forum sponsor, with super-awesome support and service.

/Hey, I'm going DW when I have to replace or upgrade my pump for those reasons.
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Old 05-16-2012, 04:34 PM   #3
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The problem with running a 255 when you don't need it is fuel recirc, fuel heat, and potential vapor locks when pushed to limits. Thus I'm leaning towards the 190 but if failure rates are higher that is more troublesome.

and as noted from http://miataturbo.wikidot.com/fuel-pump
On miatas with a return line, the 255 flows more fuel at any giving pressure level than is needed. They tend to overload the OEM FPR and cause the system to run rich even in vacuum.

so while I will run upgraded FPR later, first fire won't.
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Old 05-16-2012, 05:02 PM   #4
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190 hp
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Old 05-16-2012, 05:17 PM   #5
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Quote:
Originally Posted by aaronc7 View Post
190 hp
Defend.
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