Stumbling out of idle

seacamper wrote: Is this an accelerator pump problem? Is it a jet setting issue? do I need to rebuild the carb? Does it sound like a tune up issue? Thanks, Tom

Tom,
The accelerator pump would be my first guess. A carb rebuild isn't a bad idea as well as a tune up but that does depend on how many hours since the last one.

Tom,
Do you mean the exhaust manifolds are Osco?

Tom,
No, the Osco manifolds are after market so a PO must have replaced them possibly due to running salt water. What else do you know about the engine?

Orlando76 wrote: I believe we determined it to be a true Escort engine.

Yup, I just went back into Tom's posts reminding myself about the boat. It's an Escort!

Ok Brian, That is the easy fix. I will try that and get a rebuild kit on order. I may as well get points, plugs, wires fuel filter & rotor going as well. Has anyone put a fuel/water separator on an Escort? How about a strainer? How about a flush pro? It looks kind of tight for that plumbing.

Tom,
I agree with Brian regarding the Flush Pro. Many here have built there own. Do a search for "Tim's flush system". It may also be in the FAQ thread.

Thanks Guys
I will look for the parts.

maybe check your mechanical advance on the distributer too

Eh, that ebay is crap, its been apart, the transfer tube is hanging and the metering block looks older than the bowls.

Best rebuild what you have. Clean the meting block. set timing to 10 btdc.

seacamper wrote: The accelerator pump seems to be squirting immediately. HOWEVER, there is a slight amount of leaking at the throttle shafts, so I assume that would cause a vacuum leak while running...

Do you have any video or at least a pic of that leak?

You have a 351, right?

You'd want the 600 cfm version. The top one on that page is for a 302.

I don't have any personal experience with National Carb, but it sounds like people have had good luck with them.

PCV is probably marine specific Tom. Loads and usage is far different on a marine engine.

The lower carburetor gasket (between the spacer and intake) is specific and can not be substituted. The upper doesn't really matter.,

phatsat67 wrote: PCV is probably marine specific Tom. Loads and usage is far different on a marine engine. The lower carburetor gasket (between the spacer and intake) is specific and can not be substituted. The upper doesn't really matter.,

Zach, i am replacing these gaskets as well.

So is this order correct: carb, right gasket, spacer, left gasket, engine? (middle gasket unused)


The guy that rebuild my carb said the exact opposite to you (carb to spacer is specific and lower can be whichever) and wants me to flip the gasket order from what I have above.


Thanks,
Spiral

if you are using an aluminum spacer /wedge and you have an open plenum you have to use the one on the right between the intake and spacer i have always used 2 of those . now if you have the 4 holes on the intake i'm not sure it matters for the bottom one

Hey Doug,
I did get the carb from National, and it appears new. They do not take your old carb back. That means for you, you could buy the carb from National, rebuild yours, and have a spare on the shelf for troubleshooting. Do you have a PCM engine? What is the condition of your fuel/water separator? How does your internal filter look? Could you have a vacuum issue like I did? The guy I talked to who "built" my carb, was the guy who installed the 6.5 power valve at National Carb. After finally getting the gaskets on, the carb was awesome. I like the fact that National actually bench tests the carbs before they send them out.
For Spiral, yes, the gasket order you describe is what I used. It works great. I am not the expert, so I do not know if it is by the book, but it works great on mine.
Tom