Hi,
i know that this was asked before:
https://umod.org/community/excavator-lock/40733-limit-amount-of-diesel
But i would actually request the same. Because i don't want to install a complete plugin for the only purpose of modifying excavator-related features when i already have the excavator-lock-plugin.
Maybe you can reconsider adding a Diesel-Limit to the config? :)