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EFV-8 Club Forum / General Ford Discussion / cold start

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Posted By Discussion Topic: cold start -- page: 1 2 3 4 5 6     46fordnut 05-28-2011 @ 5:13 PM reply profile send p.m. Member Posts: 332 Joined: Oct 2009 here is a good one ...if my car lays around for more then a day i have to prime the carb 6 times then it stays running. fuel pump issues??? runs good other then that. car is 1946 ford and is a flat 8 with glass bowl pump. then i had it out tuesday and drove fine. shut it off did not restart until 15 later.when it does this it does have spark. temp gauge was in the middle. 100 horse running wild This message was edited by 46fordnut on 5-28-11 @ 6:47 PM ford38v8 05-28-2011 @ 7:06 PM reply profile send p.m. Senior Posts: 2774 Joined: Oct 2009 Sounds like a Ford, all right. A hot start is usually more successful if you press and hold the gas pedal to the floor while you crank. The reason is, you open the throttle plates to allow more air, which will suck less gas. Otherwise, you flood the engine if you pump it. The same applies whenever you smell gas: To clear a flooded engine, press, hold, and crank. Alan 46fordnut 05-28-2011 @ 7:20 PM reply profile send p.m. Member Posts: 332 Joined: Oct 2009 never had this trouble always started fine regardless of engine temp. 100 horse running wild ford38v8 05-28-2011 @ 7:49 PM reply profile send p.m. Senior Posts: 2774 Joined: Oct 2009 OK, a bit more information to go on! The two symptoms, many pumps cold, and no start warm (good spark), may be due to a bad economizer valve. This will cause leak down, which drains the carb over time, but will also flood the engine for a hot start. A sure test for the economizer (power) valve is to remove it and attempt to draw a suction on it to your tongue. It has a one way valve, so if it won't stick one way, try it the other way. A related question for others... When replacing the economizer, some don't fit due to the radius at the bottom of the threads. Instead of machining the valve to fit, there should be enough meat on the carb to countersink for clearance. Whatcha think? Alan supereal 05-28-2011 @ 7:53 PM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 Is your coil an original? Failure to restart when hot is often the result of an overheated coil, which reduces spark until it cools a bit. This is aggravated by low voltage due to a hot starter. 46fordnut 05-28-2011 @ 8:11 PM reply profile send p.m. Member Posts: 332 Joined: Oct 2009 coil does say ford on it brown plastic in color. but i still dont get if it cold and wont start unless fuel is added what this would have anything to do with it. hot start is only sometimes. cold start is all the time. if i start it every other day its fine. lets say if it sits for a week is when the cold start is trouble. can it be the battery is week turning the engine to slow to pull fuel from the tank? last battery voltage was 6.09. 6 volt system. 100 horse running wild ford38v8 05-28-2011 @ 10:11 PM reply profile send p.m. Senior Posts: 2774 Joined: Oct 2009 46, to clarify, we understand that your spark is good on a hot start, so we can eliminate any electrical malfunction. We can now confine the question to the fuel/air ratio. Your car starts OK after a period of one or two days, but requires additional pumping if it isn't started for a week. This tells me that your carb is slowly losing the gas reserve from its bowl, and as a result, your engine is starved for fuel. Your economizer valve, if faulty, will leak causing that effect. Your additional pumping fills the bowl, allowing the engine to start. The same leak from the same economizer valve can also show itself as a flooding situation when hot, causing your engine to not start as it normally should. Your engine will not start due to an imbalance of the air/gas ratio required. Going back to your question of possible weak battery, that is always a possibility, regardless of anything else. All batteries will fail, it's just a question of when. If your battery is living on borrowed time, replacement is called preventive maintenance. If it fails before replacement, it can be called "Just my dumb luck". Alan 46fordnut 05-29-2011 @ 6:08 AM reply profile send p.m. Member Posts: 332 Joined: Oct 2009 i dont pump the gas pedal i just add fuel to the carb it will fire up run for a second or two then stall. i repete this a couple of times then it will stay running . i do this cold. hot i did not try this. 100 horse running wild supereal 05-29-2011 @ 8:20 AM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 Every old Ford I've owned started differently. My '47 would't start without a shot of starting fluid after sitting for a long time. After checking everything, I came to the conclusion that if it started after priming, it wasn't getting enough fuel to run. Almost all my other cars flooded easily, I was concerned about pumping the gas before starting. Finally, I pumped it several times, and it popped right off. I don't do it, or have to, when the engine is warm. You have to try different approaches to learn the quirks of each car. 46fordnut 05-29-2011 @ 1:36 PM reply profile send p.m. Member Posts: 332 Joined: Oct 2009 i use to just set choke and she would fire right up. now the only way is to dump fuel in to carb 6 times then she will stay running. last time this happened i rebuilt the fuel pump and it worked fine. i think it maybe the new fuels eating the rubber dia. last time i rebuilt the the pump was over 2 years ago. 100 horse running wild

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