Blast it all! Just finished a 150 mile trip with the P5 running perfect until filling up with fuel just before getting home. Still ran OK on the road, but wanted to stall at idle. I made sure the economizer circuit was all open and the float bowl on the HD8 was full of clean fuel. No debris, and the glass filter bowl was clean by the engine. I readjusted everything and richened up the main jet. and it started running OK for a few blocks after which it died completely. Originally pulling out the choke would keep it going, but not after it died. Now it will quickly run for 3 seconds and die when I start it. Fuel pump will tick a few times when ignition turned on, and then stop like normal. Clearly seems to be a lack of fuel but I can't figure what from. Perhaps a blocked fuel line from the tank, or maybe a split diaphragm in the carb?? Next step is to check fuel line and tear carburetor apart, I guess. Anyone out there have thoughts or suggestions??
40 years of playing with British cars and SU carbs and I've never had this happen before. djm16 I owe you a night out at the pub. The carburetor needle had indeed loosened from the piston, and the final straw leading to a short tow home was when it fell completely out. Luckily all the pieces were still there, and after putting it together a bit more firmly, and re-tuning the carb, she is running sweetly again. What a relief/joy since I had about checked everything else. Yesterday you could have bought the car from me for $100. With djm16's advice the price just skyrocketed to $10,000 or beyond today. So stop by and name your poison djm16 and it's yours for the night. (But you have to pay for your own transportation across that big, big pond on your own!)