Here we have a greasy, but otherwise ordinary fuel filter that is mounted against the bulkhead of a 1989 GMC S15 pickup.

This particular truck features GM's tried and true 2.5L "Iron Duke" inline 4-cylinder engine. I'm not sure of the year range or engine variations where this was done. But at some point during this platform's design, the fuel filter ended up being located under the hood.

The fuel supply and return lines are routed along the frame rail to the underhood area and then turn upward. The supply line flows into a fuel filter then to the throttle body. Excess fuel is routed from the throttle body through a return line back to the tank. Seems legit.

But there's something just not quite right here.

Uhm . . .

It features threaded fittings that can be seen in the photo above. When a fitting is tightened, the line will lock into whatever position it happens to be facing.

In the case of this S15 pickup, the fuel supply line is RESTING AGAINST THE EXHAUST MANIFOLD ! Not near it, not toward it, but the gasoline supply line is in direct contact with the exhaust manifold ! This is not how you do this ! And yes, I corrected it . . .