I need a diagram of a 1991 ford f150 serpentine routing, there is no diagram under the hood.

it will be under the hood,all vehicles have it,

find yours

serpentine diagram for 1994 ford f150 Bing images

There should be a diagram of the belt path on inside of the engine compartment. It will be on the under side of the hood or right by the latch.

Most belt diagrams are on the crossbar where the hood latches.

there should be a decal under the hood somewhere that shows the belt routing.

if you go to a parts store with the information then they will be able to sell you the proper belt. if you have removed the AIR pump then you will have to try different belts until you get one that will work without rubbing on anything when its installed and running. if your lucky you may still have the belt routing decal under the hood either on the rad support or on the underside of the hood or air box. if not then the parts store may be able to help you with the routing.

OK - here is - :

there should be a routing diagram on the fan shroud or underside of the hood. what size engine do you have?

Here's a link to the diagram you need...

http://www.gates.com/common/part_locator/view_diagram.cfm?id=S7006

Good luck and please rate this solution. Thanks.

Im going to assume is has a 5.0 or 5.8. If it is here you go.