Mounted on top and inside the fuel tank assuming a t4 is a car or truck.
If your was originally equipped with a carburetor it will be just in front and below of the #1 cylinder.
late 1992
At the side of the water pump
in the fuse box .to the right and under the steering whell
take it to a Land Rover dealer, get them to test the instrument pack fuel gauge with their diagnostic unit (T4) if it's not that it will be the fuel pump/sender unit in the tank.
I think its in the same place as the T4 - behind the hazard warning switch on the dash.
Assuming you're refering to a T4 Transporter, the glow plug relay is the bottom right relay beneath in the fuse bok behind the drivers side cubby box thing. it's number 104.
Relay 102 on a T4 VW controls the glowplugs. It contains a heavy duty set of contacts for the glowplugs and an auxilary circuit that times the plugs on/off and provides the yellow indication light (glowplugs on) on the dash
the head
The fuel sending unit is inside of the tank. The unit has a float that is connected to a variable resistive device that sends a signal to the gauge to show the fuel level.
it will raise t4 levels
The old Total T4 test (TT4) is no longer considered the best way to test for T4 levels. T4 and T3 can both be bound by other proteins and hormones in the body. When this happens, the T4 or T3 is not usable by the body. The body can only use T4 and T3 that is not bound, or free. For this reason, Free T4, which only tests the free levels of the hormone, is now preferred over Total T4 testing as more accurate.