Hello all,
I recently reinstalled 5.0L Mercruiser after overhaul of floor. Motor was pickled in diesel while out. Drained the diesel, Replaced oil, Fuel/water separator and oil filters. By the way motor ran perfect before removing. Hooked up all wiring, turned it over without plugs in and blew out excess diesel from cylinders. I did a valve leak down test on each cylinder and each checked out good. Anyway she fired right up from a prime of the Rochester 4bbl (Rebuilt just before pulling motor and was in perfect working order) from just pouring a bit of fuel in the front 2 bbl. I then placed the fuel pickup line into a 1 gal. gas to get her to burn off the rest of the diesel residue. This is where the problem began. No fuel pickup. I then thought Oh I forgot to prime the fuel/water separator filter. So I filled the filter and reinstalled. So I did that and still no pickup up to the carb.
Today I measured into a see through ready-mix cup 350ML of fuel. Disconnected the main carb feed line to the carb and siphoned up until I got a mouthful. (used about 50ML out of the cup) Reconnected the mainline to the carb' , primed and fired right up. It appeared to pick up about 10-20ML of fuel out of the cup but she starved out. Finally I watched the cup to see if any flowed back in and bubbles started coming out. I'm thinking ok. So after several attempts - prime start starve, prime start starve, I decided to feed fuel manually to get her to run about 2 minutes thinking that would do it. NO luck.
I read an article today where I guy wrote that it took him an hour of this to finally get the system to pickup. Any thoughts. I am beginning to think fuel pump but before I run out and spend $125 I thought I would ask here. Another thing that comes to mind is if an air leak in the carb'/intake gasket would cause a pick up problem?
I recently reinstalled 5.0L Mercruiser after overhaul of floor. Motor was pickled in diesel while out. Drained the diesel, Replaced oil, Fuel/water separator and oil filters. By the way motor ran perfect before removing. Hooked up all wiring, turned it over without plugs in and blew out excess diesel from cylinders. I did a valve leak down test on each cylinder and each checked out good. Anyway she fired right up from a prime of the Rochester 4bbl (Rebuilt just before pulling motor and was in perfect working order) from just pouring a bit of fuel in the front 2 bbl. I then placed the fuel pickup line into a 1 gal. gas to get her to burn off the rest of the diesel residue. This is where the problem began. No fuel pickup. I then thought Oh I forgot to prime the fuel/water separator filter. So I filled the filter and reinstalled. So I did that and still no pickup up to the carb.
Today I measured into a see through ready-mix cup 350ML of fuel. Disconnected the main carb feed line to the carb and siphoned up until I got a mouthful. (used about 50ML out of the cup) Reconnected the mainline to the carb' , primed and fired right up. It appeared to pick up about 10-20ML of fuel out of the cup but she starved out. Finally I watched the cup to see if any flowed back in and bubbles started coming out. I'm thinking ok. So after several attempts - prime start starve, prime start starve, I decided to feed fuel manually to get her to run about 2 minutes thinking that would do it. NO luck.
I read an article today where I guy wrote that it took him an hour of this to finally get the system to pickup. Any thoughts. I am beginning to think fuel pump but before I run out and spend $125 I thought I would ask here. Another thing that comes to mind is if an air leak in the carb'/intake gasket would cause a pick up problem?