dave-r wrote:Well I fired the engine up yesterday to break the cam in.
To make sure it fired right up I filled the center carb fuel bowl to the max and also poured some fuel down inside the fuel line.
It fired up straight away and I got the revs straight up to 2500 and kept it between 2K-3K for about 30 seconds. Then it died.
Zero fuel pressure. The lines are empty.
Well maybe the mechanical pump just didn't have time to drag the fuel along that big old 1/2 inch line and fill that big fuel filter?
So today I have had another go. Twice. Filled the carb both times. Both times it died after 30 seconds. Still no sign of fuel in the lines.
I think my next step will be to remove the pump to make sure it is OK. Then somehow fill the line from the tank to the pump as well as the lines from the pump to the carbs.
Any other suggestions?
Dave, what micron size is that fuel filter? And where precisely is it located in the fuel line in regards to the mechanical pump? Is it possible the pump cannot produce the necessary suction due to the restriction from the fuel filter if it's below 100 microns it should be after the pump, above that size it can be before the pump. Just a thought
Another option is to see if a small Holley Blue would help the situation, I'm sure it would. You could temporarily splice it in the rubber section and hook it up to see if it alleviates your problem and keeps it running.
Of course it might have to be regulated depending on how much pressure it makes. Also is the fuel pump pushrod in the engine? Just curious Dave, but why dont you have an electrical pump with your rev potential and power output and fuel system size?