Originally Posted by overlander63
On most P series chassis (I am guessing you don't have the workhorse chassis, it's a little too old) the relay is going to be mounted on the cowl under the hood, usually just left of center.
Looked under the hood every square inch up and down, I bought the new relay so I know what the relay and connector look's like. The chassic manual shows the relay in two places and one is right where you explained and the other was on the backboard above the brake peddle. Still no luck.
Ya found location of relay. Removed engine cover and up above air conditioner compressor just to the left mounted to a support. Could feel it but hard to see. This fixed my long cranking problem and low voltage going to the fuel pump error. Error code DTC=54
It's worth the twenty bucks before you replace a fuel pump.