Triumph Repair: spritfire 1500, triumph spitfire 1500, vent system

Question
Hello
I have a triumph spitfire 1500 , 1975

car runs great starts good after diving for about hour. then you stop for a bit if you only sits for about 30min starts fine if the car sits for an hour or so starts fine , but if it is in between that time it has trouble starting you have to hold the gas peddle all the way down then finely starts. then runs fine. it the between partway cold and really warm if has trouble starting. not sure what to check.
thanks ken

Answer
Ken, when it will not start, it is either too much fuel or not enough fuel. This is easy to test. When it fails to start, spray either starting fluid in the intake or something like WD-40 works well. If it then starts you know it is a lack of fuel. Low float level or fuel pump problems or in hot weather the fuel may boil out in the float chamber.
If spraying fuel does not start it, pull a couple of plug quickly to see if they are wet. If so, it is flooding and you need to look at too high float level or high fuel pump pressure. You also need to check the float chamber vent system. Open it to outside air for a test.
let me know,
Howard