I found an injector in my 1990 7.3 IDI diesel leaking today, can I replace just one injector if only one is leaking fuel or do they all need to be replaced?

 

It's OK to replace just one IMO.

 

It's OK to replace just one IMO.

 

This is a truck I got last weekend and am planning to sell soon, do you think replacing just the o rings on the injector would stop the leak, I took it out and sealed the threads to the leak has to be because of the o rings or the piece the fuel likes connect to

 

Oh, so you mean leaking externally? Usually, when someone says "leaking injector" I think of internally leaking, which will cause a knock. Yes, I would try replacing the o-rings and return lines first. That is a very common maintenance item on the IDI, and you can buy a kit to do it all on eBay:

http://www.ebay.com/itm/Ford-International-7-3L-IDI-Diesel-Injector-Installation-kit-91-94-/221209309409?pt=Motors_Car_Truck_Parts_Accessories&hash=item33811a30e1&vxp=mtr#ht_1864wt_934

 

yep, leaking externaly on top of the motor,somewhere between the threads that screw into the block and the hard line on top of the injector, ill give o rings aq shot first, thanks for the help