Hi all. I'm new to this group and hoping someone can help me. I have an EZTrak Z225 with a single cylinder Briggs and Stratton engine. I want to replace the fuel pump, but I'm not sure how it's attached to the housing. I've replaced a similar one on my Huskee, but it's not obvious how I get this one off and I don't want to damage the housing. Is this a plastic nut cap? I can't tell. Thanks in advance for any advice.