I just replaced the mechanical fuel pump on my 78 Bobcat wagon and ran into a similar issue (at dusk, on the side of the road, no less.) what I needed to do was to disconnect the power steering pump bracket, slide the ps pump up to where I could set it on top of the windshield washer fluid reservoir, then the small arm that bolts to the side of the ps pump could be rotated upward and back and gave me access to the rear bolt using a deepwell 1/2 inch socket and a 2 inch extension- hope that helps!