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EFV-8 Club Forum / General Ford Discussion / missing ... fuel flow ???

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Posted By Discussion Topic: missing ... fuel flow ???     EdB 10-16-2010 @ 7:43 PM reply profile send p.m. Member Posts: 47 Joined: Nov 2009 new gas tank, carb kit, in-line filter, plugs,wires, points. was running fine; started missing, became progressively worse. there was a thread about measuring fuel out of the pump which I can't find. Thinking that Tom O submitted that. that info plus any other suggestions appreciated. Thank you. Old Henry 10-16-2010 @ 10:10 PM reply profile send p.m. Senior Posts: 738 Joined: Apr 2010 Two ways I test the fuel pump: 1) Test the flow by disconnecting the fuel line from the carburetor. Hold that end in a pint jar. Start the engine and let it idle. The jar should fill in 30 seconds to have adequate flow. 2) Test the pressure by putting a pressure guage on the end that you disconnected from the carburetor and crank it (without the ignition on.) You should get between 1.5 and 3.5 lbs. of pressure. Still Old Henry Old Henry 10-16-2010 @ 10:14 PM reply profile send p.m. Senior Posts: 738 Joined: Apr 2010 A quicker way to see if you're getting enough gas to the carburetor: Look into the carburetor while working the throttle. You should see and hear gas squirting into the carb. If so, you're at least getting gas into it. If not, figure out why not. Plugged fuel line? Plugged fuel filter? Weak fuel pump? (Test as above.) Still Old Henry Old Henry 10-16-2010 @ 10:18 PM reply profile send p.m. Senior Posts: 738 Joined: Apr 2010 If it seems like you're getting plenty of gas to the carburetor and the pump is OK, then you've got to start checking ignition. I do that preliminarily by putting a timing light on the high voltage wire from the center of the coil to the distributor and crank it to see if it's firing and go from there. Keep us posted on what you do and we'll help you figure out your problem. Still Old Henry supereal 10-17-2010 @ 8:09 AM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 If you are running an old original ignition coil, it is more than likely the cause of the problem. As an old coil is run, and gets warmed up, it begins to fail and mimics a fuel problem. Another source of an apparent fuel problem is a failing or failed condenser. Pin down the problem before you start changing things, or you will probably introduce another. 37RAGTOPMAN 10-17-2010 @ 4:40 PM reply profile send p.m. Senior Posts: 1958 Joined: Oct 2009 Edb try putting a ice pack directly on the coil when it starts to run badly, when starts to run badly,shut it down, apply the ice pack for 5 minutes, then restart the car and see how it runs, I went though this a few times with various OLD FORD V8'S when the coil gets hot ,the winding's start to short out, causing lose of spark, lets hear how you made out, 37RAGTOPMAN an KEEP on TRUCKIN,,,!!!! TomO 10-18-2010 @ 9:28 AM reply profile send p.m. Senior Posts: 7250 Joined: Oct 2009 Don't guess, Check your spark for a 1/2" blue spark when a plug wire is held close to a head nut and the engine is idling. You should have at least 1/4" spark when trying to start the car. Weak spark can be caused by a defective coil, defective ignition resistor, defective condenser, incorrectly gapped points or a corroded ignition switch. Low fuel delivery usually shows up first at speeds above 35mph. To check fuel delivery, you need a graduated 16 ounce or larger container to determine the amount of fuel delivered in a measured time. Disconnect the fuel pump line from the carburetor and direct it into a graduated container. Crank the engine long enough to get 2 ounces of gas in the container and then continue cranking for 15 more strokes of the pump. The pump should have delivered 6 more ounces of gas. Insufficient fuel delivery can be caused by a vacuum leak, plugged flex line, worn pivot in the pump arm, stretched diaphragm, plugged fuel line or tank pickup, plugged tank vent or wrong gas cap or a worn push rod. Tom

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