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Only the hoses between the carbs are 1/4" on 1850 and Sprint, all the rest are 5/16" (8mm)
Steve
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For 1500cc dolomite owners our car have the same arrangement as the Sprint and the 1850.
I have just been and re measured the pipes in the engine bay of my 1500 SE with a micromotor - everything from pump outlet is 6mm ID bore as the steel cross engine bay and carb to carb pipes are 6.3mm OD
Tank hard line to pump rubber looks to possibly be 8mm bore, but I can't get it off to measure properly where it is in the garage atm so I suggest the op
dave1850 measures up before ordering.
IIRC 6mm ID was tight on the pump outlet, but did go on when I changed the pipes (and pump) back in June
I've never replaced hard lines on a 1500SE, specifically, but I have on a couple of 1850s, several Sprints and also my old 73 Toledo. All of those cars had 8mm hard lines from back to front, including the stub pipe out of the tank itself. Also the pipe connections in and out of the fuel pump. It's a job I do frequently enough that I keep a roll of 8mm microbore copper central heating pipe in stock and have a set of original steel pipes in my indoor work room to use as patterns for bending up new ones. And a 30' roll of Gates Barricade 8mm hose, now half gone!
I do know the 1500 Spitfire had 1/4" hard lines throughout, as did many of the other "small chassis" Triumphs and I suspect the 1300FWD may run 1/4" pipe too, but not any Dolomites or Toledos that i'm aware of, with the exception of the pipes that actually connect the metal undercarb distribution pipe to the float chambers, which is 1/4". There may be differences in the underbonnet layout of some OHV cars, I have less experience with those models. It's even concievable that OE pumps on 1300/1500cc cars had a 5/16" inlet and a 1/4" outlet. If they did, I never noticed back in the day. However, if you know better.......
Steve