Not Truly Successful

drbarbara · #1 07-04-2008, 09:27 PM

After getting your feedback about my non-marine carburator I started thinking that I should name my boat the Molotov. Because I am not able to get a marine carburator today I decided to start doing other improvements today. First I was going to take the old fuel line going from the fuel pump to the carburator so I went to the autopart store and was able to find steel line of the same diameter and with the same thread nut. I removed the old fuel line which was wrapped in electrical tape an had some sort of black gooey stuff around it and it turns out that it was steel line. (see pictures)

After removing the electrical tape and gooey stuff (which was not easy) I ended up with a clean line

My carburator had piece of what looked like a 5/16 pipe where the fuel line attached. The thread from the new line was 1/4. After looking for a reducer in west marine, B&F Marine, Napa and Home Depot and comming up empty handed I was forced to give up and cut a piece of marine grade fuel line to attach the steel line to the brass fitting in the carburator. I understand this is not the best way but I had no other choice. After this I fired up the engine and then my trouble started. When going at high RPM (3000) the engine runs fine but when I dropped it to idle it looked like fuel was comming out of the bowl ( I was not happy at all with this)

I am posting two links to vide of the carb. I have no idea what the problem is. I put the inline filter back to see if somehow it had anything to do with the problem but no such luck.

This clip is going at 3000 RPM with no problem

http://www.docathome.us/BoatPictures/MVI_1857.AVI

This one is going around 1000. You can acually see fuel collecting on the horizontal plate

http://www.docathome.us/BoatPictures/MVI_1858.AVI

Any ideas. Sorry about the length of the post.

THEFERMANATOR · #2 07-04-2008, 09:44 PM

I'm coming up with the same video in each one. They both sound like around 3000 and running pretty good.

drbarbara · #3 07-04-2008, 09:48 PM

Sorry I corrected the bottom link

THEFERMANATOR · #4 07-04-2008, 10:13 PM

That carb needs some serious work. I bet what is happening to you is the needle and seat is running over from the looks of it. But it also looks like you have a leak in the accelerator pump plunger through the top I believe.

I just looked at your video again, and it is DEFINATELY overfilling with gas from the pictures. Be careful as running without your flame arrestor and raw fuel is how explosions happen. I wouldn't run that engine anymore until you get that fixed. That isn't just a running problem, that is a safety problem. If it were mine I would find a good 2 barrel ROCHESTER off of a 305 CHEVY or 4.3L V6 engine and put that on it. There are a couple on EBAY now, but they need rebuilt.

drbarbara · #5 07-05-2008, 08:26 AM

Why a Rochester instead of swapping it for a Holley. Is there anything I don'tknow about the Holley that is to be avoided. I will not run the boat unitl I get it fixed. Today I will change the rest fo the fuel line which is not marine grade. See how it goes today. Thanks for the adivce.

BigDaddy · #6 07-05-2008, 08:55 AM

In my expierences, its that the rochester is cheaper and easier to work on than a holley. I had a holley 650 vs on an old hotrod and was constantly blowing the power valve. I put a rochester 4 bbl on it and never had another carburation issue.

THEFERMANATOR · #7 07-06-2008, 02:15 PM

Nothing wrong with a HOLLEY, the ROCHESTERS are just cheaper and more plentiful. And I would give the economy edge to the ROCHESTER over the HOLLEY as well. HOLLEY'S are nice simple carbs, about as basic as you can get. The ROCHESTERS are a little harder to work on, but still not bad. Plus in your HP range the ROCHESTER would probably be better suited. And 2 barrel HOLLEYS in marine apps aren't very plentiful as the ROCHESTER in a 2 barrel was more widely used.