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OS 91 FS w/pump power problem

Old 07-21-2018, 11:46 AM
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Join Date: Aug 2005
Location: Zagreb, CROATIA (HRVATSKA)
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Default OS 91 FS w/pump power problem

my engine today start with problem. It works fine up to half power, but at higher setting to full power it looses rpm.
Engine is not new. I replaced glow plug and all tubes. Tank is also checked, no findings.
At full power it works in some mid range and looks like heavy reach mixture. Needle is on same position for meny years...
Any advice! Regulator problem?


Old 06-23-2019, 06:10 AM
Join Date: Jul 2003
Location: Bellevue, WA
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Hello Danijel,
This post goes back a while but on my engine I noticed that both the regulator and pump were leaking fuel at high powers. I had to replace the pump as well as the cover on the regulator.

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