it has happed to me
the valve on the rear brake line is to limit brake force on the rear ie.loaded full pressure,empty reduced pressure to stop the rear brakes locking.
On the '87 B2000 the fuel is under the hood, on the right wheel weld. It's white--fuel line comes in: goes out. If not there, look around the fuel tank. I have an '84 B2000 and the fuel filter is directly in front of the driver's side rear wheel above the frame rail as it curves upward towards the rear. It is a small white canister with in/out ports sitting in a wire holder. I looked under the hood along the left (driver's side) wheel well and it's not there on this model.
The SE-5 package has a limited slip differential but it doesn't fully lock.
It could have a limited slip rear end.
Yes, there are locking rear ends available from many after market sources.
the interior lights are found at the base of the rear-view mirror, in the center front of the headliner.
this truck was made to be lowered but it depends on how low do you want i can tell you how to lay the frame on the ground email at the fixer0508@dotnet.com if you just want to level it out get a set of 3 inch blocks for the rear much lower you will need a little more shop skill For the front you just need to loose the torsion bars the height you want
in the rear. open the hatch and lift up the carpet inthe right corner by the taillight. its under there
The 2014 Mazda MAZDA5 has 39.4 in. of rear head room.
The 2012 Mazda MAZDA2 has 46.8 in. of rear hip room.
The 2007 Mazda MAZDA3 has 37.4 in. of rear head room.