Published on June 23, 2026 Author Riffraff Diesel Share article Facebook 0 Twitter 0 Mail 0 7.3 Power Stroke Fuel Bowl Rebuild Guide: Fix Common Fuel Leaks for Good AS SEEN IN OUR JULY 2026 ISSUE – Buy Now! Riffraff Shows You How Fuel leaks on the 7.3 Power Stroke are something that, as an owner, you will have to deal with at some time. While there are other areas that spew unwanted fuel from time to time, the fuel filter housing, or fuel bowl, is the main culprit. Given the number of things the fuel bowl does and the number of moving parts (and seals) it has, there are just more possibilities of leaks with it than anything else on the truck. Doing a full fuel bowl rebuild is cheap and easy and will save you headaches down the road. In a perfect world you’d want to remove the fuel bowl, fully disassemble it, clean it thoroughly, rebuild it, and reinstall it in the truck. However, we know most of you are going to tackle each individual leak as it happens, so we’ll go through the process here, individually. While we have the fuel bowl out of the truck, it is not 100% necessary to do so for any of these leaks covered. All parts used came from RiffraffDiesel.com and are either OEM parts or from the companies that supplied Ford/International in the first place (plus some upgrades when necessary, from Riffraff Diesel). For this rebuild we will be using a Super Duty fuel bowl; however, the OBS process is very similar.Subscribe Our Weekly Newsletter Parts Used: Fuel Bowl Heater Element 1999-’03 Fuel Bowl FPR Complete Rebuild Kit 1999-’03 7.3L Complete Fuel Bowl Seal Kit w/ Fluorosilicone Drain O-rings 1999-’03 Riffraff Diesel Billet 7.3L Fuel Bowl Cap 1999-’03 Step 1: With the fuel bowl on a bench, the first thing to address is the fuel bowl drain valve. The valve is held on with four T20 Torx bolts. Step 2: Once the valve is removed, we need to disassemble it. Step 3: After pulling off the valve lever (no tools required), this plastic tube must be removed as well as the check ball it’s holding in. A small-course thread screw can help with removal. The screw only needs to be lightly installed, and the sleeve can be easily pulled out by pulling on the screw. Be careful not to lose the check ball behind the sleeve. Step 4: Next, the valve shaft needs to be removed by pulling it straight out of the assembly. This shaft does need to be clocked correctly to be removed. Rotate the shaft until you see a flat spot, and then it can be pulled out. Replace the old shaft O-ring with the new O-ring supplied in the Riffraff kit. The shaft can then be reinstalled into the assembly, keeping in mind that the flat spots must line up correctly with the assembly. The check ball and sleeve can be reinstalled at this time as well.Note: Use a bit of clean diesel fuel as lubricant on the O-ring to ease reinstallation. This step should be used for all seals from here on. Step 5: Next, replace the O-rings on each of the two port/gallery plugs. Removal is done with a 3/16-inch Allen key. Once the O-rings are replaced, lube them with diesel and reinstall. Step 6: The Water-in-Fuel (WIF) sensor is the next to tackle. Remove the two T20 Torx screws followed by the sensor itself. Step 7: Replace the two O-rings and lubricate them, and the sensor can be reinstalled. Step 8: The check valve assembly and fuel heater are next. Within the bowl, remove the two T20 Torx screws, and both the heater and check valve assembly can be moved aside for the next step. Do not fully remove these parts yet. Step 9: The check valve assembly and fuel heater were removed. Step 10: As is extremely common, this fuel bowl’s heater has failed. We’ll be installing an upgraded part in its place. Step 11: The check valve assembly must be disassembled so that the internal O-ring can be replaced. Make sure it goes back together as shown. Also be sure to replace the O-ring on the outside of the assembly with the supplied O-ring from Riffraff Diesel. Step 12: Replacing the heater element is best done with a newer-style unit like this one. It’s an International part supplied by Riffraff that is known for its reliability and long service life. It installs just as the old unit did, with no modifications needed. The freshly rebuilt check valve assembly and new heater will then be installed as shown. The heater will serve as a retainer for the check valve assembly, so it must go on last. Don’t forget to plug in the new heater’s electrical connector. Step 13: Almost to the finish line, the fuel pressure regulator (FPR) is next up. Remove the two T20 Torx screws, and the assembly will come off easily. However, this part is under pressure from the spring behind it, so use caution. Step 14: The FPR housing will be reused here, with a new O-ring—the brass poppet and spring will not be reused. A new poppet and regulator spring are included in the Riffraff kit. Step 15: The brass poppet sits in this sleeve, in the fuel bowl housing. Removing the sleeve may require pressure from the backside with a punch or other blunt object. We will not be reusing the old sleeve, as a new one is included with the kit. Step 16: With a fresh O-ring on the new sleeve, it can be pressed back into the fuel bowl assembly followed by the brass poppet and its new O-ring. Step 17: One very popular modification often made to the FPR is increasing fuel pressure with these springs. Riffraff recommends using the gold spring, which is rated at 61-65 psi.Fuel Pressure Regulator SpringsSilver spring: 55-60 psiGold spring: 61-65 psi *RecommendedBlack spring: 66-72 psi Step 18: The FPR housing (with its new O-ring) can then be reinstalled over the new sleeve, poppet, and spring. Step 19: Before reinstalling the fuel bowl into the truck, a new Riffraff Diesel billet fuel filter cap and Motorcraft filter are installed. The Riffraff billet fuel bowl cap not only looks great, but it’s also much stronger and features a Viton O-ring for superior sealing. Step 20: In the last step, which can be done when the bowl is in the truck but before the lines are reinstalled, the fuel line seals must be replaced. There are four of these seals: one for each supply fitting to the heads, one for the FPR, and one for the supply. These seals go on the fuel lines themselves, between the flare and the nut. Photos by Riffraff Diesel Total 0 Shares Share 0 Tweet 0 Pin it 0 Share 0
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