Re: What next? Starter?

Posted by HH56 On 2016/8/8 8:29:04

Yes, the filter should be almost full with all the cranking you have been doing. The filter could be clogged, pump failing or the screen inside the pump full of sediment. This is the time most benefit of having a separately controlled aux pulse type electric pump mounted near he tank. You can turn the pump on to fill the line and get fuel to the carb so all the extended cranking is not needed. Once engine is started turn the electric pump off and let the mechanical do the job.

If the pump screen and filter is found to be OK a few other things that have been found is a pinhole somewhere in the fuel line allowing the pump to suck air instead of fuel. The small rubber hose between fuel line and pump has been known to harden or crack inside and restrict flow. If you have old rubber in the pump or line and are running ethanol fuel that could have swollen or otherwise deteriorated. If the tank has been sitting for ages it could have some rust or other debris restricting the fuel line inlet so gas can't flow. Some have installed non vented gas caps and if the tank is original it may not have the little emergency air notch in the filler neck some have been talking about. With no vented cap the pump suction is not strong enough to pull fuel from the unvented tank.

If the fuel in the tank is old it may not be of sufficient quality to fire the engine and can also deposit varnish on the valves causing them to stick.