What i have done when suspecting the fuel pump is bad or weak, is put a fuel pressure gauge in between the pump and carb. I bought a small Mr. Gasket fuel pressure gauge. I had to put brass step down fittings on the gauge inlet and outlets to match the inside diameter of the fuel line. You will need another length of fuel hose to replace the hose when you are done. You might look for a cracked fuel line or loose connection also.
"We only learn in two ways,one from reading,the other by association with smarter people" Will Rogers