68 Scout 196 Vaccume Advance Question

[mervteck]

So ive got everything done to get this beast running under its own power once again EXCEPT for the vacuum advance setup. I have absolutely no idea where the source is let alone what hose goes where. And im too broke at the moment to buy the repair manual Would anyone be so kind as to take pictures showing where what goes where? Or scan and upload the pages of the manual that tell me? I really wanna drive my beast

Much Thanks!

[sean sirvaitis]

the source for my 304's vacuum advance is on the front of the carb, at the base. IDK what carb you've got, but I would suggest looking for an unused vacuum port on the front side... failing that, there may be one on the side or at the back that will work. Most of us are not about to post shop manual images, as it can and does constitute copyright infringement. however, we are ALL more than willing to help a fellow binder in need, and will do what we can to set your rig right.

edit: the vacuum advance should only have one hose.. from the unit to the carb... pics of your carb would help.

[Albuq. Henry]

Yeah what carb are you running... It isnt necessary to run vac advance. so if you want to drive it in the mean time you are good to go...

[mervteck]

ive got a Holly 1904 on it and at this point i figure its the vacuum advance that's my issue... It starts and idles fine but when you accelerate it stutters and #%!@s up making it so i cant go faster then maybe 5 mph in first gear and im almost 100% sure the timing is set right and almost 100 % sure its good fuel and plenty of it. Any thoughts guys?

[Albuq. Henry]

no, vac advance shouldnt cause the problem you are getting...

sounds like fuel starvation, to me right off the bat..

whats the history of this scout? has it sat a while was it running then started acting up? any carb work done recently?

[mervteck]

I rebuilt the carb about 2 weeks ago. To my knowledge it sat non op for 2 - 3 years. but ive had it running and idling just fine quite a few times now. Its right when i get to the ... driving part ( the most fun and important part ) that it chokes up and says ... nah i dont wanna go. Ive got an electric pump in now from tank to pump, pump to carb thinking it was the mechanical that was causing a fule starvation problem. but at this point i think i need to put electric pump in-between the tank and the mechanical for a little extra flow. Thoughts?

[Albuq. Henry]

I would double check your float level first. At first I had mine too high and it was getting heat soaked and would over flow. I played with it until it was too low. It would cut out pulling a hill so then I went back up a bit.

another thing with the electric pump make sure it doesnt put out too much pressure. it could force fuel past the float valve, doensnt sound like your problem but anyway.... you can ad a cheap mr gasket fuel press. regulator after the pump....

here is some good reading on the 1904...
http://www.ihonlynorth.com/forums/ca...b-stuff-3.html
around post 39 we are talking about float level.

[Albuq. Henry]

What I would do right now is try to drive it make the problem happen and without cranking or idling remove the bowl cover and see how much fuel comes out. to get an Idea if the bowl was too empty.

One more thing to look at while the cover is off. make sure you are not getting any interference with the gasket. It is possible that it can touch the float and the float will hang up and not move...

[George Womack]

Have you verified that your accelerator pump is working? A non-functioning pump will cause a big time stumble/hesitation.

The stock vacuum advance fitting on the Holley 1904 is at the back of the carb and points straight back at the firewall. It's the only place for a fitting other than the fuel inlet. The carb is tapped for 1/8" pipe thread, and into that is screwed a brass 1/8" pipe thread to 3/16" inverted flare adapter. This provides ported vacuum to the vacuum advance.
I'm of the belief that the distributor should get full manifold vacuum instead of ported vacuum. To do this you would plug the carb fitting with a 1/8" pipe plug and tee into your wiper vacuum hose for manifold vacuum to the distributor. Google "ported vacuum" for lots of info on this subject.

[Albuq. Henry]

George, why is it that you prefer full manifold vac.? Seems like the ported would allow for more advance but then when the engine lugs the vac would drop off not ping....?