barricade88 Posted June 29, 2013 Report Share Posted June 29, 2013 I was driving to the store and when I walked out to my truck, I started it and drove off but then it died. I could get it to fire. It would turn over but that was it. I'm thinking it was flooded? Cuz it sounds like it was getting too much fuel. I'm not really sure what else it could be. I had spark to my coil and to number 1.. I got it runnin after about 20 minutes in the 90 degree weather. Any suggestions?? Quote Link to comment
Radiant-Designer Posted June 29, 2013 Report Share Posted June 29, 2013 Weber carb? I have a simmilar issue on mine which I think is due to fuel pressure Quote Link to comment
datzenmike Posted June 29, 2013 Report Share Posted June 29, 2013 Do you have the fuel return line connected and working? Hot motor sitting in the heat for 10 min is a recipe for vapor lock. The gas boils in the hot fuel lines and even inside the carb. It can boil over and flood but you said it started so probably the pump was just compressing fuel vapor in the lines. A fuel return line will cure this. Quote Link to comment
barricade88 Posted July 1, 2013 Author Report Share Posted July 1, 2013 Yeah, my dad took my return out awhile ago... And yeah it's a weber... I'm having a lot of bogging down problems with it still.. And I don't know what to do Quote Link to comment
Radiant-Designer Posted July 1, 2013 Report Share Posted July 1, 2013 I dont think the weber has the option for a return line, at least mine doesnt have one attached. Do you have a fuel pressure regulator attached to it? Webers like low pressure (under 3.5 psi) most of the issues that I read about on the webers are fixed with a regulator. Quote Link to comment
datzenmike Posted July 1, 2013 Report Share Posted July 1, 2013 The carb doesn't have really anything to do with the return line. You can connect it up. The return looks like this... fuel line from tank to the fuel pump. Fuel from pump to a line that goes over to the carb where there is a connection to the carb, then looping back near the pump again. In the end on the line is a restriction with a small pin hole in the end, then a line back to the fuel tank. The small restriction is important so that fuel will build pressure between it and the pump or the gas will simply follow the path of least resistance and flow back to the tank. With pressure between the pump and the restriction, gas will now be forced into the carb. At all times a small amount of fuel will be passing through the small pin hole and returning to the tank. This constant circulation replaces the heated fuel near the carb with cold fuel from the tank. If the fuel should get so hot that it boils, any vapor bubbles will be pushed along and back to the tank. Quote Link to comment
barricade88 Posted July 4, 2013 Author Report Share Posted July 4, 2013 Should I put my return back on then?? And I thought of putting a regulator but that's a $40 part that may or may not work... But I don't think I have a choice huh? Quote Link to comment
datzenmike Posted July 4, 2013 Report Share Posted July 4, 2013 If you have all the hard lines between the pump and the carb yes, put them back on. The 620 has two hard lines on the frame near the starter. The larger diameter one is the return. There is also a hard line for vacuum advance between the carb and the dizzy so you may see three lines in that area. Quote Link to comment
barricade88 Posted July 5, 2013 Author Report Share Posted July 5, 2013 Okay, I might have to go buy a hose. But should I get a fuel regulator?? My carb still bogs down between 5 and 15 mph and it sounds like crap and sometimes backfires. I was thinking Im getting too much fuel and it's flooding it Quote Link to comment
datzenmike Posted July 5, 2013 Report Share Posted July 5, 2013 There's more to the return than just connecting the line up. There is a small restriction in that return so that the pump will build som pressure or else the gas will just run right pasts the carb and back into the tank. Here is an L20B return line. This end with the hole connects to the hard line back to the tank.... NOTE the small hole. The hose below it is the pressure line TO the carb. Quote Link to comment
barricade88 Posted July 6, 2013 Author Report Share Posted July 6, 2013 Oh okay. Do you think I should put an electric fuel pump? I do have a weber on and a few people have told me to put in an electric fuel pump Quote Link to comment
datzenmike Posted July 6, 2013 Report Share Posted July 6, 2013 You have a mechanical fuel pump on it right? Then run it. Why make this hard? Another advantage of a return line is that when the motor stops the fuel pressure quickly bleeds out the return hole. Quote Link to comment
barricade88 Posted July 7, 2013 Author Report Share Posted July 7, 2013 Yeah it's mechanical. And I don't want to add all this electrical crap but if it will make my truck run better ill do it. But should I just get a fuel pressure regulator? Quote Link to comment
Radiant-Designer Posted July 9, 2013 Report Share Posted July 9, 2013 well thank you Mike, again your knowledge astounds me. I think I am going to hook mine back up (probably wire brush the end and blow back through it to make sure its clean first) and try running it that way. Of course my pressure regulator is between the pump and the carb, so I may just omit it for the time being. I belive that i read the pressure from a stock pump isnt that much Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.