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2G Fuel pressure fluctuation

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Hey so you mentioned using a Toyota o-ring in the factory neck of the pump? I really hate the stock design of these pump slip fittings and always use a evo fuel pump grommet to seat into the factory sending unit. I’ve had issues with the o-rings style leaking pressure when the regulator gives pressure feedback it blows the fuel back into the tank through the o-ring on the pump

Also I’m assuming you are running an external relay to the bigger pump and not trying to run a big pump on the factory connector?
 
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