Diesel World - - Contents -

Re­stric­tions in a fuel sys­tem not only rob horsepower, but the ex­tra stress on pumps and in­jec­tors will re­duce their ser­vice life. With a good, clean sup­ply of fuel your rig will run bet­ter, pro­duce more horsepower, last longer and will most likely get bet­ter mileage.

Af­ter a few years on the road the Ford 7.3L’s in-tank fuel fil­ter clogs up, re­strict­ing the afore­men­tioned fuel flow. But Ford de­signed this sys­tem with an­other fault. Be­ing a re­turn-type sys­tem (fuel is sup­plied to the en­gine, it uses what fuel it needs and returns the re­main­der to the tank in an end­less loop of sup­ply and re­turn) the re­turn is too close to the fuel pick-up. This may not sound like a prob­lem, but the re­turn is gen­er­ally filled with tons of lit­tle air bub­bles. The pick-up ends up tak­ing its sup­ply of fuel from this frothy area of the tank. This frothy, air-filled fuel greatly hin­ders per­for­mance and over­all en­gine ef­fi­ciency.

The fix can be found us­ing a kit made by Driven Diesel. This kit in­cludes all the fit­tings needed to re­lo­cate the re­turn line and delete the stock in-tank fil­ter. Also in­cluded is a can­is­ter-style fuel fil­ter and mount to re­place the one fil­ter that’s be­ing re­moved from the tank. This fil­ter is eas­ily ob­tain­able from just about any truck stop or auto parts store and will stop harm­ful par­ti­cles in the fuel from dam­ag­ing the frame-mounted sup­ply pump.

In­stal­la­tion does re­quire ei­ther re­moval of the bed or drop­ping the tank to ac­cess the fuel pick-up. We headed to our lo­cal shop, Pickup Parts in Mis­sion Viejo, Calif., for the pro­ce­dure. All said and done, the in­stall took just a few hours to com­plete.

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