beta losing power when hot.

[rosssomerville]

Hi, This problem I thought had been erradicated when I rebuilt the engine but has just re-appeared. What happens is the car runs great on warm-up then under heavy acceleration it starts to lose power almost until stalling but then if left to idle sorts itself. I am thinking that it is fuel starvation but the fuel pump is new as is filter and the injectors have been asnu cleaned. I havent set up the ignition advance properly yet so could it be this? Has anybody experienced this before?

[ticoruiz]

Could it be hot air from the underhood coming into the carb (or carbs). ? That upsets greatly the jetting and robes power. That was my experience with twin carbs.

[rosssomerville]

That could be the problem as at the moment the filter is directly above the cam box as I havent yet sorted an intake pipe. I also dropped the petrol tank out and emptied the contents to my horror! It had fuel yes but also lots of crap too, it had turned into a red sludge so I cant imagine this was helping the engine much. I have also changed all the fuel pipes, filter and pump cleaned out the tank and refilled with super unleaded. I plan to put a bottle of fuel system cleaner through it. So fingers crossed and once the air intake has been sorted I will be up to full power soon. I would strongly suggest everybody with a beta cleans their fuel tank out.

[ticoruiz]

You are definetdley out of fuel, and that's the problem. Because hot air into the carb robs 10-20% power but never to almost stalling. In my country the petrol started to be mixed with bioethanol (from sugar cane) and when that mixed into the tank I had the same expierience with rubish in the tank. Watch out for rust in the pipeline.

[davidb]

The lazy way to clean the tank is to take off the rubber filler
hose inlet. Swab the bottom out w/terry cloth towels then
get a decent sized magnet on a rod & "vacumn" the tank
bottom. No substitute for dropping the tank & boiling it
out agreed but it does work . How many other cars have
the gas tank inlet right in your face fully accessible for this
half measure ?