Grumpy Bear
Regular Contributor
So, my 1975 Merc 500 50 hp starts right up, runs great, warms up, but then won't restart (or has a very hard time starting back up) after it has been shut off for a few minutes. Here is what I've done so far: new gas (no ethanol), gas additive (Quickleen), new fuel pump kit, new sparks. I have carb kits coming in the mail. Any thoughts on why it would run great but then not run great after warm up and shut off?