I got the Walbro fuel pump GCL602-1. The check valve that came off the car had a spring in it and looks like a check valve. The fitting that came with the Walbro is hollow and not a check valve. Does the Walbro have a internal check valve?

no.

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

So I would need to use the original connector/check valve?

Does Walbro fuel pump have check valve?? - Pelican Parts Technical BBS

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Somebody PMd me and gave me the answer for the above model number. Check valve not needed if you let the pumps spin up before starting the car. I didn't want to put the original check valve back on because it is longer and I was worried about mashing something inside the pump when screwing it in.

Solved!

you'll be buying a bosch pretty soon. the walbros don't have the guts for a kjet car-replaced MANY over the years. good luck, chuck.