The relay is behind the intake manifold near the firewall.
On top of the engine
1990 f350 did not have a turbo, unless it was fitted after market, so check what engine you have such as year and size and then maybe we can answer your question
GAS OR DIESEL?
On a 1999 Ford F350 diesel, the vacuum pump is typically located on the driver's side of the engine, mounted to the front of the engine block. It is driven by the engine's accessory belt and is usually positioned near the power steering pump. Accessing it may require removing other components, depending on the specific engine configuration.
how do i down load a wiring diagram for a f350 6.0 diesel engine compartment
International. Always have, and always will.
under conductor seat on the frame
14 quarts
14 quarts
On a 1989 Ford F350 with a diesel engine, the fuel filter is typically located on the driver's side of the engine bay, near the fuel injection pump. It is often mounted on the frame rail or near the engine block, making it accessible for maintenance. Be sure to consult the vehicle's service manual for specific details and diagrams for your model.
The Cam Position Sensor (CPS) on a 1999 Ford F350 7.3L diesel is located on the front of the engine, near the top of the engine block, just above the timing cover. It is mounted at the rear of the engine, close to the fuel filter bracket. To access it, you may need to remove some components for better visibility and access.
top of the engine next to the fuel filter housing,it looks like a startes solinoid