Hello, i have a super duty f 250 1999

Im looking for the fuel pump diagram, i need to connect the fuel pump directly to the battery because im having relay problems

regards!

 

You're really better off figuring out what your relay problem is and fixing that. Have you checked the cut off switch on the passenger kick panel? Are you getting codes that point to the relay? What motor do you have?

 

My problem is when i running the truck, after 20-25 miles the trucks acts like run out of fuel and the fuel psi pressure drops on acelleration (i cant go more than 2000 rpm) but if i turn off the truck and turn it on again inmediatly the truck runs good por other 10 miles. i replaced the fuel pump and fuel filter and the problem remains, when the truck stalls i put some ether on the air inlet of the motor and the truck runs good for a second, so is not a spark o ignition problem.
its 5.4 v8 with 122 000 miles on it.

thanks and sorry my bad english!

 

no codes, also i check the innertia switch, clean injectors and fuel lines

 

What you're describing sounds like a fuel restriction or bad pump. Since the pump is new, have you looked inside the tank for any debris that may be plugging the fuel pick up? Checked for a cracked inlet tube that may be sucking air? Are there any screens between the fuel pump and the inlet which may be clogged? Any chance you just got bad gas?