So I have an 84 Mercruiser 140 3.0 that I just did a lot of work on and now she sometimes runs ok under 3k rpms and sometimes won't run for more than 10 seconds. I threw an electric fuel pump on her after the original went bad to save some money and now I think she isn't getting enough fuel with it, so I bought a marine mechanical pump but the cam lifter thingy isn't in the same position as my original pump, it's more straight, then up. My question is will this new pump still work? And does anyone have suggestions for my fuel issue? The picture with the pump upside down is what my original one looks like. and the other one is the pump I just bought.