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Old 09-09-2010, 02:25 PM   #1
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Default Fuel Pump Installation for 93 - Walbro 190 HP

Hello all!

I have a need for a new fuel pump that can handle fueling for my 8PSI supercharged setup (JR) in my 93. I just bought a walbro 190 HP and I have been told by the site I bought it from that there are some modifications on 90-93 miatas for the walbro fuel pump installation. They also said to check this forum for instructions for the mod.

Can someone describe what modification, if necessary, is required for a 90-93 NA for a walbro fuel pump install or point me to the link here? It looks like a direct replacement of the existing walbro that I have installed (190 LPH) but I want to be sure.

Thanks everyone!!!
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Old 09-09-2010, 02:28 PM   #2
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The 190HP pump will directly replace the 190 pump without need for modification.
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Old 09-09-2010, 02:31 PM   #3
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Thanks.... that's weird they mention on their webiste modification is required.

http://lightningmotorsports.com/walb...s/g-59598.aspx
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Old 09-09-2010, 02:31 PM   #4
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Oh.... don't assume I did the 190 right originally.
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Old 09-09-2010, 02:42 PM   #5
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To install my 255 wally into my '90, I cut most of the bell shaped end off the metal tower holding the pump, leaving just a lip there to bite onto the hose I used in it's place. This was suggested to me because some have claimed to have had o-ring to bell-end sealing issues. When I 'downgraded' to the 190, I just took the 255 off and cut the new hose to the correct length to fit up the 190.

All this being said, if you already have a walbro in-tank in place, the new one should fit right up. They all seem to have pretty much the same shape and overall length.
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Old 09-09-2010, 02:56 PM   #6
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Thanks everyone....

Here's the link for future reference.

http://miataturbo.wikidot.com/fuel-pump-install

It looks like my original installation was flawed for my 190 LPH. I did NO cutting at all in the outlet line from the pump and just butted it up against the 190. The outlet metal line, if I remember correctly, had a female rubber end that fit over the nozzle on the 190 pump. I bet that is why I am having fuel pressure issues to begin with.

Urg!
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