Instructions for 10601 Fuel Rail KitThis kit is for 1986-'93 Mustang 5.0L engines. Will also work on 1994-'95 5.0LMustang engines if a smaller diameter than stock distributor is used. This FuelRail Kit can also be used with the Professional Products #54126/54127 intakemanifold for 351W engines.

Kit #10601 - Fits 1986-93 Mustangs and other vehicles equipped with the5.0L engine. Will work on 1994-'95 engines if early style distributor is used.Stock 1994-'95 distributors interfere with driver's side fuel rail. Note that thiskit can also be used on the Professional Products 54126/54127 intake mani-fold for 351W engines. However, if you have the 351W engine in a 1994-'95Mustang and attempt to use our 54150 or 54151 Elbow Adapter (normallyrequired for installation into a 1994-'95 Mustang), the regulator used in thiskit interferes with the throttle body.

NOTE: Check the drawing and bill of materials on the back side of theseinstructions to make sure you have all the parts listed. This kit is suppliedwith an inlet and outlet fitting to connect to the stock Ford fuel lines. If youwant to plumb your own lines, substitue AN fittings for the supplied fittings.

REMOVAL OF EXISTING FUEL RAILS (If applicable)1. Disconnect the ground connection to your vehicle's battery. This is a safe-ty precaution. Allow engine to cool before proceeding. 2. Your stock fuel rails will have a valve on them that looks like a tire valve.This will usually be at the front end of one rail and will have a black plasticcap on it. Remove the cap. If you press on the core of the valve, it willrelease the pressure in the fuel rails. Caution!! Fuel will spray out and youshould have a towel or other absorbent cloth to catch any fuel that isreleased. Bleed system until flow stops. Wipe up any spills that may occur. 3. Remove any bolts or screws that hold the rails to the engine. You maywant to save these screws as some of them have other uses. However, newstainless screws are provided in the kit for reattaching our rails if you do notneed or want to use the stock screws. 4. Remove inlet fuel line and return line. Not all systems will have a returnline. Most EFI systems use a type of push-on fuel line connector to the fuelrails. A special tool is required to remove these connections. These tools arevery inexpensive and are available at most regular auto parts stores. Yourlocal NAPA store would be a good source. 4. Detach electrical connections from each injector. Disconnect anythingattached to fuel rails. Remove the fuel rail assembly. Each injector has an o-ring on each end of it. One end fits tightly into the rail and the other end fitstightly into the manifold. When you lift up on the rails, it may pull off of theinjectors or it may bring some of them with it. If so, be careful that they donot drop out and become damaged. Handle injectors with care. 5. Inspect the o-rings on the injectors. If you see any deterioration or cuts orslices, they must be replaced. It's not a bad idea to replace them in any eventif the vehicle is not new.

INSTALLATION OF FUEL RAIL KIT1. Lubricate O-rings on both ends of injectors with a light oil or WD-40 orequivalent. 2. Carefully push injectors into manifold. Do not cock them sideways whenyou do this or you can damage the O-ring. 3. Attach triangular shaped brackets (Item #20) to rails using #10-32 buttonhead screws. (Item #21) Tighten screws enough that brackets can still bemoved from side to side but with some effort. Do not allow them to be loose. 4. In this kit is an angle regulator adapter. (Item #1) It has a 1/4-NPT tappedhole in it which is for the return fuel line. If you want to use the stock returnline, thread the supplied stainless steel return line fitting (Item #9) into thistapped hole. Do not use Teflon tape as it can shred and get into the fuel sys-tem, clogging the injectors. Use a special sealant for pipe threads available inany hardware store, such as Loctite #569. Determine the finished positionthat you want the fitting to be in. The fitting is designed to approximate theposition of the stock return line on the factory fuel rail. Please carefully fol-low these steps when installing any fitting into any of the fuel rail parts.Clamp adapter in a vise using special jaws to protect it from damage. Threadfitting (with pipe sealer on threads) into adapter. Tighten it with a wrenchuntil it stops. Then back it out about a half a turn. Then retighten it. Eachtime you do this, it will go in a little further. Keep doing this until lit reachesthe correct position that you want it. 5. Thread the blue adapter fittings (Item #4) into the back end of both of thefuel rails. These are 3/8-NPT to -6AN fittings. Use thread sealer and screwfittings snugly into rails using the step and reverse procedure described in

Step 4. Do not over tighten or you might split the rails. Split rails are notcovered by warranty. 6. Take blue reducer fitting (Item #7) and thread it into the front end of thedriver's side rail following same procedures described above in Steps 4 and5. Then thread the supplied 1/8-NPT pipe plug (#6) into the reducer. If youwant to utilize the factory fuel pressure bleeder valve, you can unscrew itfrom your stock rails or get one from a Ford dealer and thread it into thereducer instead of the pipe plug. The Ford part number is E0AY-9H321-A.7. Attach Item #1 fuel delivery adapter to side of the passenger side rail. Thepassenger side rail has a small nipple sticking out of the side. Place the twosupplied O-rings into the grooves of this nipple. CAUTION: Do NOT try to putthese rings on dry or you will damage them. Coat with oil or other lubricant.Then, with lubricant still on rings, push the stainless angle bracket onto thenipple keeping it straight as possible. Align screw holes and attach bracket torail with (2) supplied M5 x 36 long stainless screws. Tighten securely. 8. Thread the large stainless Fuel Inlet Fitting (Item #5) into the front end ofthe passenger's side rail. This will allow you to connect the stock fuel line tothis fitting. Again, tighten this fitting in stages, backing it out between tight-ening until it is in the correct position. 9. Position each fuel rail over the injectors and with lubrication on the injec-tor O-rings, carefully but firmly push rails down until you feel them seat.10. Look at the relationship of the triangular mounting brackets to the mani-fold. If there is space between them and the manifold, use the supplied alu-minum spacer washers (#8) between the brackets and the manifold. Somemanifolds may not require these spacers. Place the 1/4" flat washers onto thefour 1/4" screws and thread the screws through the triangular brackets (andspacers if used) and into the manifold. You may have to move the triangularbrackets left or right to align holes. If you can get to the #10-32 screws tosnug them down, do so. But if you can't, remove the rail being careful thatthe triangular brackets do not shift position. Tighten the #10-32 screws andreinstall the rails, spacers, screws and washers and tighten down snugly. 11. Look at the supplied fuel pressure regulator. (Item #2) On the bottom is anipple with two O-rings. Lubricate the O-rings and insert the nipple portion ofthe regulator into the adapter bracket that you bolted to the passenger's siderail. Again, make sure the nipple goes in straight and O-rings are not dam-aged. Using supplied two M5 x 12 long stainless screws, bolt the regulator tothe adapter bracket. 12. Take supplied crossover hose assembly (Item #3) and attach it to the two-6AN fittings. Tighten snugly with an 11/16" wrench.

FINAL STEPS OF INSTALLATION13. Go over entire system and check that every single connection is tight. 14. Reconnect battery.15. Turn on ignition so that electric fuel pump begins pumping but do notstart car. Recheck all connections for any leaks. This includes where injectorsgo into fuel rails. If leaks occur, turn off ignition. Correct any problems. Wipeup any gas puddles.16. Repeat step 15, again carefully checking for any leaks. 17. Once you are confident that no leaks occur, start engine and check forleaks again with engine running. Check where injectors seat into manifold.Again, if you see any leaks, immediately stop engine and fix the problem. 18. It is a good idea to check your system on a regular basis to make surethat no leaks develop, especially in the first few days you drive the vehicle.Gasoline leaks can turn into a very dangerous and expensive proposition.

SPECIAL INSTRUCTIONS FOR FUEL PRESSURE REGULATORSThe regulators used in these fuel rail kits are factory pre-set for 40 PSI offuel pressure. We suggest you check the pressure with a fuel pressuregauge. Pressure adjustments must always be made with the engine idling.Turn the top adjustment stud clockwise for more pressure, counter-clockwisefor less. Tighten lock nut once desired pressure is obtained. Typically pres-sure should be set in the 40 to 50 PSI range for EFI equipped enginesdepending upon the application. Check specifications for your specific sys-tem. The 1/8-NPT port in the side is for a fuel pressure gauge. You can use aProfessional Products #11113 gauge (or equivalent) which will thread direct-ly into this port.