bella Posted December 13, 2005 Share Posted December 13, 2005 Everything started since I run out gasoline:banghead:. After that change my gasoline filter, my mechanic has clean my carb but still not starting than after 8-10 attempts. I have dual fuel system(gasoline and LPG), and if I try to start on LPG is starting normal but winter is coming and in the morning I MUST use gasoline for starting the engine. So, what do you think guys?.....One more thing, after engine is warm, if switch from LPG to gasoline my engine not die but is not working so good and it has less power on it wich is unexpected. Thank you. Link to comment Share on other sites More sharing options...
nipper Posted December 13, 2005 Share Posted December 13, 2005 First check to make sure the fuel pump is working, and putting out the proper presure and flow. nipper Link to comment Share on other sites More sharing options...
bella Posted December 13, 2005 Author Share Posted December 13, 2005 First check to make sure the fuel pump is working, and putting out the proper presure and flow. nipper Ok.How I do this and what values should I have to be ok. Thanks Link to comment Share on other sites More sharing options...
Subarian Posted December 13, 2005 Share Posted December 13, 2005 With the carbureted engine, it's easy. You don't really need a pressure guage, because the pump only has to get fuel to the needle valve. Just remove the fuel line from the carburetor and put it into a container (a glass jar works fine), and turn the key on. You should have fuel running into the container. It should only take about 30 seconds to fill the container 1/4 to 1/2 full. Also look at the condition of the fuel. It may have water or other contaminants in it. If it does, you'll probably have to drain your tank, unless it's a small amount of water. If you do find water, you can add about a liter of denatured alcohol to your tank. The alcohol will mix with the water and allow it to run through the engine. I would also check your needle vavle and your float level. You say your mechanic cleaned your carburetor, but did he put a rebuild kit in it? Needle valves tend to stick when they get old, and the only cure is to replace them. I would also ask your mechanic (or whoever opened up your carburetor) what the float bowl looked like. If there was water in there, it's almost guaranteed there's still water in your tank. Link to comment Share on other sites More sharing options...
nipper Posted December 13, 2005 Share Posted December 13, 2005 Your close, you need to time the flow into a pint container, that will give you the GPM. ALso you should check the pressure. The pump may work fine with no pressure on it, but when it has to do work, may fail. If you are going to do the test, do it right generally, but since this is a no start condition at all, just pop the line and see if it flows out. Do it as close to the carb as possible. SInce i dont know how the system works on this car, it is quite possiblee that the fuel recirculates (i have to read up on LP conversions). If it doesnt first thing you replace is the fuel pump relay. Usually fuel pumps are fairly robust and dont go bad, BUT if its old, and you let the tank run down real low, a weak pump or dying pump can fail. The pump uses fuel to help keep it cool. Running it down on a new pump is not a big deal, on an old pump may push it to the edge. I am not saying this is the cause of your problems, but its a start nipper Link to comment Share on other sites More sharing options...
Subarian Posted December 13, 2005 Share Posted December 13, 2005 Actually, in Hungary it will probably be liters per minute. Running the tank low won't hurt an external pump. That's true of an internal pump, but the older subarus all have external pumps. The fuel around the pump in an internal pump helps to cool it, but only the fuel running through the pump on an external pump helps cool it. The fuel pump relay may be the culprit. On my 86 carbed subaru, I ran a new line from the positive terminal on the coil to the fuel pump and bypassed the relay completely, after having been stranded twice by bad relays. Link to comment Share on other sites More sharing options...
nipper Posted December 13, 2005 Share Posted December 13, 2005 Actually, in Hungary it will probably be liters per minute. Running the tank low won't hurt an external pump. That's true of an internal pump, but the older subarus all have external pumps. The fuel around the pump in an internal pump helps to cool it, but only the fuel running through the pump on an external pump helps cool it. The fuel pump relay may be the culprit. On my 86 carbed subaru, I ran a new line from the positive terminal on the coil to the fuel pump and bypassed the relay completely, after having been stranded twice by bad relays. Ok forgot that it was an external pump. Then he should be bale to feel the pump run with his hand.. nipper Link to comment Share on other sites More sharing options...
Subarian Posted December 13, 2005 Share Posted December 13, 2005 On mine I can hear it running. I think my neighbors can too! Link to comment Share on other sites More sharing options...
zyewdall Posted December 13, 2005 Share Posted December 13, 2005 I have dual fuel system(gasoline and LPG), and if I try to start on LPG is starting normal but winter is coming and in the morning I MUST use gasoline for starting the engine. Thank you. You can't start on LPG when it's cold? I've never owned an LPG car, or an LPG/gasoline dual fuel car, but around here alot of people use LPG generators, because they start alot easier when it is cold than gas, or especially diesel generators. I'm confused now. Link to comment Share on other sites More sharing options...
Subarian Posted December 13, 2005 Share Posted December 13, 2005 I used to have a truck that ran on LPG. The problem is vaporizing the fuel correctly. There's a convertor that's warmed by water from the cooling system to make sure the fuel vaporizes before it enters the engine. Link to comment Share on other sites More sharing options...
bella Posted December 14, 2005 Author Share Posted December 14, 2005 You can't start on LPG when it's cold? I've never owned an LPG car, or an LPG/gasoline dual fuel car, but around here alot of people use LPG generators, because they start alot easier when it is cold than gas, or especially diesel generators. I'm confused now. Yes you ca start engine on LPG even if is verry cold but is not recomended because LPG is more "dry" than gasoline and can hurt your engine.Also when my carb was working, my car starts at first try in the winter, now I must do 2-3 tryes befor start=>damage my battery and my electromotor(I hope this is wright word). Paul Link to comment Share on other sites More sharing options...
zyewdall Posted December 14, 2005 Share Posted December 14, 2005 Yes you ca start engine on LPG even if is verry cold but is not recomended because LPG is more "dry" than gasoline and can hurt your engine.Also when my carb was working, my car starts at first try in the winter, now I must do 2-3 tryes befor start=>damage my battery and my electromotor(I hope this is wright word). Paul By dry, do you mean that gasoline gives it more upper cylinder lubrication when starting cold? Although I'm not used to thinking of gasoline as having any lubrication properties, I suppose it's still got more than propane/LPG I think the electromotor is what we call the starter motor. Link to comment Share on other sites More sharing options...
bella Posted December 15, 2005 Author Share Posted December 15, 2005 Wright,wright,wright. By dry, do you mean that gasoline gives it more upper cylinder lubrication when starting cold? Although I'm not used to thinking of gasoline as having any lubrication properties, I suppose it's still got more than propane/LPG I think the electromotor is what we call the starter motor. Link to comment Share on other sites More sharing options...
Mudboat Posted December 15, 2005 Share Posted December 15, 2005 A restriction in the fuel system somewhere, or you may have air entering through a fitting upstream of the fuel pump. Check all hose connections and make sure you're not sucking air into the fuel pump. Make sure the fuel filter is indeed clean, even though you had it changed. Check fuel pump flow and pressure. Pressure should be under 4 psi. You may also want to pull the top of the card apart and make sure your needle and seat is not hanging up. You may need to put a carb kit on it.. Link to comment Share on other sites More sharing options...
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