Carburator nightmares!

[Guest]

History Commands

[October 31, 2008, 07:12:23 PM] Lindz: Does anyone know where I can find a VW bus year65-70?

[November 03, 2008, 10:42:19 AM] Theizzardking: CHECK THE THREADS ON YOUR SPRAK PLUG HOLE IT MAY NEED TO BE HELI COILED IF IT HAS BEEN STRIPPED OUT.

[November 03, 2008, 10:43:03 AM] Theizzardking: THE REASON IT MAY SHOOT OUT IS THAT THE PRESSURE CREATED UNDER THE PLUG FROM THE COMBUSTION PROCESS WAS TO GREAT TO HANDLE

[November 03, 2008, 10:43:33 AM] Theizzardking: THE POORLY THREADED HOLE, THIS SHOULD BE THE ONLY REASON FOR A SPARK PLUG TO SHOOT OUT, IT CAN HAPPEN FROM CROSS THREADING 

[November 03, 2008, 10:43:55 AM] Theizzardking: AND OR OVER TIGHTENING OF THE PLUG

[November 16, 2008, 05:20:01 PM] rastafoo: hey! anyone out there(there,there....there)

[November 16, 2008, 05:42:03 PM] John: yo!

[November 17, 2008, 03:57:03 PM] McT: Art im in chat...

[November 17, 2008, 03:58:24 PM] McT: Working up north -bad 3G connection on my laptop

[November 17, 2008, 08:06:20 PM] vaccinium: how do you post a comment in the forum?

[Today at 08:23:32 AM] fastmc25: You just did.........

[Today at 03:09:49 PM] prizma: gah! i need a vw bus roof

[fastmc25]

Sounds like you both may be needing a new fuel pump......(or double check there are no restrictions from the tank or filter....... trash in the tank can cause some of these symptoms too)..... under throttle or high idle the engine sucks the fuel fast and the pump can't keep up (maybe bad diaphragm)..  gravity will send some gas to the carb in a trickle fashion.... only to be used up quickly on start up..... 

Just a thought..... this would be my first look.... 

[rastafoo]

Update:
I'm focusing on the carb right now - the timing was way off, I have that under control, but when I was turning the fuel/air mix screw(center bottom of carb-34-36 DFAV weber progressive) I turned it all the way in and waited for it to start sputtering so I could turn it out 1 and 1/2 full turns, it actually revved a bit higher and kept running strong with the screw all the way in the 'shut' postion! don't know what that's all about......
I adjusted the tab that the float uses to move the jet up and down because it was only keeping 1/4 inch of gas in the bowl. Now it keeps the bowl half full, I think it's just a bit of fine tuning needed there. We had messed with it earlier and probubly screwed it up. Grant is going to lend me an in-line fuel pump to see if that is bad, but I doubt it - the engine idles perfectly from startup to high revs in 2nd or 3rd gear where it just simply loses power without lurching. just slows and dies. It will idle for an hour just fine, only under load will it lose power. I think that when fuel pumps go (mechanical) they go at once and throughout the powerband, right?
Another thing that happened to a friend of mine was that his ghia had a dizzy that would not advance properly only on higher rpms, we'll check that too......
any other thoughts?

[70micro]

I have good news!!! I spent 6 hours on Sat. with a couple of good friends scratching our heads and finally got her running.  It was the nuts on the intake manifold duh right?  Man I was happy and pissed at the same time what a brain fart!  Tuned the carburator and she purrs like a kitten.      Thanks everyone for the insight!  Hope you all have some luck w/ your buses so you can do some camping and what not!  Sorry I'm obviously no help if I can't even snug some nuts down .  Andy

[rastafoo]

Just snugged the nuts down? How loose were they? 1/4 turn or more/less? Guess I should check that too.....

[70micro]

Ya, they were about a 1/2 turn to loose.  I'm always afraid of snapping something off when I tighten stuff.  I guess I need to learn what to tighten good and what not too huh?

[70micro]

Any luck? Keep me posted I will try to rally my guys to see if we can help!   

Andy

[Dj:Eep]

Ya, they were about a 1/2 turn to loose.  I'm always afraid of snapping something off when I tighten stuff.  I guess I need to learn what to tighten good and what not too huh?

Get a torque wrench and be sure you have the right torque on bolts, then you'll have no worries of snapping things off.

[rastafoo]

I've got it narrowed down to junk in the fuel tank and/or the fuel pump going. I am still driving Janis to work (5 mi.) and taking it easy - if I ask for too much on the accelerator pedal, she trys to sputter out on me, so far, so good! Now I am forced to drive the speed limit.
The new fuel pump got here today. I see the hippies have cut an access hole conveniently right above the gas tank sender (in the sheetmetal under the back seats), so I'll drain the tank, grab a flashlight and go 'gastank junk' fishing. If I can find something I'll put off pulling the tank - it is an inevitable eventuality, I know.

By the way, ratwell has a great pictoral step-by-step on refinishing your gas tank. Has anyone found a new gas tank for a bay for sale anywhere? They make them for splitties for about $118, but I cannot find a bay gas tank for the life of me - just interesting, eh?

[70micro]

I hope you don't find an old "bag" in there!  That would be sad in two ways !  I will keep my ear to the ground about a new tank also.  Good luck, Andy

[vdubyah73]

Have you replaced tank vent lines? Did you inadvertently plug it up so the tank doesn't vent? Next time it happens run around and pop off your gas cap. If you hear a wooosh of air as you open it your tank isn't venting and your getting a vacuum lock in the tank, that your pump can't overcome

[rastafoo]

Thanks Bill. Checked that already and have FINALLY gotten the electric fuel pump and installed it after a proper gasoline bath.......(not funny).
Janis runs better than ever now . I've 'gone thru' the carb and have it tuned the best I've ever seen it, have replaced all ignition stuff(points,dizzy cap, rotor,plugs,condenser), replaced all fuel lines, gone over all vac lines, and have pulled the hippie homemade access panel to the top of the gas tank and sending unit to peer inside with a mirror , drained the tank and found almost NO rust or matter in it! John Porter of Wagen Haus (vw repair) said it was cleaner than most tanks half it's age! It's nice to be able to drive at speed again - she runs better than she ever has!
I've routed the problem mechanical fuel pump back to itself in a loop, but probubly need to pull it at some point to at least remove the pushrod so as to not have the top end shaft working harder than it has to....I know they make block-off plates for that mech pump for after you remove it. Will it hurt to leave the mech pump where it is?

[70micro]

SWEET!!! Nice work and happy travels!!