Mustang Edelbrock 650 CFM Carburetor Electric Choke Installation Instructions
2. Since we’re dealing with fuel, safety comes first! Make sure you disconnect your Mustang battery
. The best time to replace your carburetor is when the engine is cold. Otherwise, you may burn your fingers or cause a fire.
3. Locate the fuel line on your old carburetor. Place a rag beneath the fuel line to catch any fuel that may spill out. Remove the clamps using a screwdriver, then disconnect the fuel line. Plug the fuel line with a wooden dowel or a center punch to prevent any fuel from coming out, as well as to prevent contaminants from entering as you work on the carburetor.
4. Disconnect the gas pedal/throttle linkage from the carburetor and move it out of the way. There’s just one nut that needs to be removed which requires you to use a 7/16 inch box wrench. The linkage can be swung out of your way as you work.
7. Remove the distributor vacuum advance hose from the carburetor. Make note of any other vacuum hoses, mark them using the tape and marker (if necessary) and remove them from the old carburetor.
8. If you have an electric choke, remove the positive wire from the choke.
9. Remove the four nuts and washers from the bolts holding down the carburetor using a 1/2 inch box wrench. If the bolts are rusted like these, replace them. Any auto parts store will carry a kit containing four new bolts, nuts and washers.
11. If necessary, due to age and rust, remove the old studs/bolts from the intake manifold and replace with new ones.
12. Clean the intake manifold surface carefully using a blade or gasket scraper, and remove any remaining gasket material. Be very careful not to allow any debris to fall into the intake manifold. Use a clean rag to stuff into the intake openings to make sure nothing falls in.
13. Install the new carburetor studs/bolts (if necessary) and place a new carburetor gasket on the intake manifold.
14. Your new Mustang carburetor
comes with a plastic bag containing plugs, owner’s manual, etc. Remove your new carburetor from the box and place the new Edelbrock 650 CFM carburetor on the intake manifold and put the washers and nuts on each stud/bolt and tighten them down.
15. Connect the gas pedal/throttle linkage to the carburetor along with the return spring.
16. Your carburetor has four vacuum ports: One large manifold vacuum port on the back of the carburetor and three ports on the front of the carburetor. The manifold vacuum port on the back of the carburetor is used for things like power brakes. If your car doesn’t have power brakes and you don’t have a need for it, you must plug this port. Edelbrock
supplies a plug to close off the port. Use some thread locker and insert the plug (as shown) to seal off this vacuum port, preferably before you bolt the carburetor to the intake manifold (but you can do it afterwards as well). Use a 1/4 inch Hex / Allen wrench to tighten the plug. Note: Edelbrock does not recommend using the rear port for the PCV valve.
17. The front of the carburetor has three vacuum ports. The larger one in the middle is a manifold vacuum port for your PCV valve. The vacuum port on the left is a timed advance port and is where you will connect the vacuum line from your distributor if you use timed vacuum advance. This port is slightly higher than the other port to the far right of it. The port on the far right of the carburetor is for manifold vacuum and is used if you have an automatic transmission and goes down to your modulator valve. If you don’t have an automatic transmission, simply plug off the port to the far right of the carburetor with one of the supplied plugs.
18. Connect your Mustang distributor vacuum hose
to the slightly higher timed advance port on the left of the carburetor (as shown above and below). If you don’t use vacuum timed advance for your distributor, plug the port with a supplied plug.
19. Connect your PCV valve vacuum line to the larger port in the center of the carburetor (as shown) and plug the port to the far right (as shown) if you don’t have an automatic transmission. Otherwise, connect your vacuum line from your automatic transmission to this port.
20. This carburetor has a straight fuel line fitting on the left of the carburetor that connects to 3/8 inch rubber fuel hose. If you don’t have Mustang 3/8 inch fuel line hose
, buy several feet of it. Do not try to press on 5/16 inch hose, because it won’t fit and you’re just asking for trouble later on when the fuel leaks.
21. You must install a new Mustang fuel filter
! If you do not, you will void your Edelbrock warranty! Connect your new 3/8 inch fuel line to the straight fuel line fitting on the carburetor and use a 3/8 inch clamp to clamp it to the fitting. Give yourself enough fuel hose length to install the fuel filter without causing the hose to kink. Install 3/8 inch clamps at each connection (as shown) and connect the rubber fuel hose to the steel fuel hose coming from the fuel pump and clamp it down.
22. Use the supplied black ground wire and connect it to the lower negative terminal of the choke housing. You can ground the choke by removing one of the choke housing bolts and connecting the opposite end to the choke housing bolt and tightening it down. If your engine had an automatic choke previously, simply connect the existing power lead to the positive upper terminal marked with a plus sign on the choke housing. If you need to make a new connection, run the supplied power lead included with your new Mustang carburetor
back to the fuse box under the dashboard and connect it to a switched 12 volt power source that's usually marked ACC for accessory. If you aren’t sure, you can use a test light to test for power at each fuse when you turn the ignition key. NOTE: Do not hook it up to the positive side of the coil since it will rob the engine of power. Do not hook it up to the alternator either.
23. Cut the air filter mounting stud to the correct size (if necessary) to mount your air cleaner and screw it into the carburetor.
24. Install the baseplate gasket on the top of your carburetor and then install your air filter. You will have to crank your engine 5 to 15 seconds for fuel to reach the carburetor and your engine should fire right up! The Mustang Edelbrock Carburetor
comes ready to go, right out of the box!