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Author Topic: A note about the Walbro E85 450LPH F90000267 fuel pump.  (Read 3664 times)
Sr. Member

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« on: April 23, 2015, 10:58:54 AM »


Just wanted to share my findings using this pump with high fuel pressure. My car is running between 1.5-1.6 bar of boost with this pump on E85. I've been facing some higher RPM and intermittent leaning out issues. I figured I am just using the pump at it's limits so a compensation in FKKVS was needed, however the real issue was (after searching online) the pressure relief valve of the pump, which starts to open at 5.5 bar of fuel pressure.
Doing what's described in "resolved" the issue and now neither any compensation is needed nor I am getting any lean spots at my boost levels. I am not saying this is a perfect solution, but at least there is someone on here who tested this method and can tell that it works.

Hero Member

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« Reply #1 on: April 23, 2015, 08:44:59 PM »

Thanks for the info.

"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
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« Reply #2 on: March 14, 2019, 07:09:37 AM »

Later F90000267 revisions include a 110psi relief valve.
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