38racing wrote:well I put the chinese pump on last night. Murphy came by to help. since main tank is a mess I used a separate test tank set up between seat and dash. routed line along existing line with shutoff and white filter. I started with carb cleaner but it only ran on it and stopped. so I poured some gas down into bowl and it ran longer but still quit. I decided to check my tank setup. I found no fuel would flow through the shutoff even when it was open. I replaced it and got flow. then I got engine to start and run fine. crazy thing is I took the first shutoff and attached it to another test tank on my bench and it flowed fine, even when reversed.
bgsengine wrote:38racing wrote:well I put the chinese pump on last night. Murphy came by to help. since main tank is a mess I used a separate test tank set up between seat and dash. routed line along existing line with shutoff and white filter. I started with carb cleaner but it only ran on it and stopped. so I poured some gas down into bowl and it ran longer but still quit. I decided to check my tank setup. I found no fuel would flow through the shutoff even when it was open. I replaced it and got flow. then I got engine to start and run fine. crazy thing is I took the first shutoff and attached it to another test tank on my bench and it flowed fine, even when reversed.
I'd have been checking the fuel line itself for possible ply separation internally - inner rubber ply can separate (especially when plugging in a filter or fitting, etc) and block off the line - can also build up fuel bubble through a pinhole somewhere in the line, then either under fuel pump pressure (typically only between pump and carb) or temperature changes (fuel expansion) that gas can swell out the fuel line until it chokes off flow. That is why I had a shop policy to always replace fuel lines (if a known prior service, every 2 years, if unknown prior service, then at that time... Fuel line was cheap insurance!)
Arkie wrote:Did you have to remove the front off the old 4 screw pump and cut off the flapper valves or get a pump through W/O opening up the pump?
Reason I ask is sometimes I can get a bypass on the carb mounted pump to the carb without opening up the pump.
Good to see that Murphy also visits other's. I was beginning to suspect he only visited me.
Arkie wrote:Very unusual for the old 3 and 4 screw carbs to get lots of gas in the oil while running and the engine stay smooth enough to operate without the operator immediately noticing it flooding. If the float/needle stuck open the engine should have flooded immediately as a heads up.
I would think about looking close AT THAT ONE at the gas MAYBE getting into the pulse hose pump side to getting into the crankcase while running since seems to indicate he sees lot of gas in the oil before it got to running rough.
I use the finer white fuel filter on my old pump carbs.
Did you get your new to you 4 screw carb and engine going????
Return to Technical Discussion Forum
Users browsing this forum: No registered users and 64 guests