I don't know about bi-fuels but the fuel filter in my '02 petrol was ahead of the LR wheel. It's one 10mm bolt to undo the keeper and the fuel lines had easy to push opposing buttons. I give a whisper of silicone paste to the nipples of the new filter.
My fuel tank vent was above the RR fender liner. You need to drill out the body rivets to remove the liner. Have a pop rivet gun and 6 or 8 larger pop rivets ready for reassembly.
Check engine vacuum with a vacuum gauge. Look for unattached lines or empty barb fittings.
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