1967 Chrysler Newport Custom 383 2brl. Stromberg carb. I bought a carb kit from Mikes carburetor. I put the accelerator pump in gas like the FSM calls for before installing it. When I installed the pump it was very tight in the bore that the spring would not push it down. I talked to Mikes carb and they said don't put it in gas just put a little oil on it before installing it. The pump moved perfectly UNTIL gas was put in the bowl to check the spray from the pump. I guess the leather on the pump swelled and again it was hard to push the pump down by hand, no way would the spring push it down. I talked to Mikes carb again and they sent me another pump (no charge) I installed it and the exact same thing happened. I polished the pump bore, stretched the spring a bit but no way will the accelerator pump move by spring pressure. I sent both pumps back to Mikes Carb after a phone conversation about the problem. I spoke to them after a few weeks and they say they see nothing wrong with the pumps or have they had any other complaints. I was able to soak my original pump in oil to soften the leather and while not perfect it does slide correctly in the bore as it should it just has a slightly weak spray. I am NOT bad mouthing Mikes Carb. I have bought from them in the past for various different cars and their kits always worked perfectly. Has anyone run into this problem? Thanks.