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73pumpkinthing Samba Member
Joined: April 04, 2016 Posts: 8 Location: mississippi
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Posted: Thu May 12, 2016 8:17 pm Post subject: At wits end |
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Purchased a running 73. It stopped one day so I decided a major tuneup was in order. Normal plugs, wires, fuel pump, coil (replaced it already), etc.
NOW it starts good and runs good most of the time but out of the blue has this terrible stumble and shake. Replaced the carb and it did NOT help. The window of enjoying the car for the Spring is closing and I need HELP. What do I look for or replace?
The fuel filter does not fill up with fuel when running. All other parts are within specs.
Thanks |
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Ratt Samba Member
Joined: April 15, 2003 Posts: 753 Location: Puyallup, Wa
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Posted: Thu May 12, 2016 8:34 pm Post subject: Re: At wits end |
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Possibly a clog in the fuel tank or fuel line. It sounds like a fuel starvation issue. I don't remember, but do things have the tank filter screen? |
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Fiatdude Samba Member
Joined: April 20, 2009 Posts: 1218 Location: now in MO.
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Posted: Thu May 12, 2016 8:49 pm Post subject: Re: At wits end |
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yes _________________ Remember, as you travel the highway of life,
For every mile of road, there is 2 miles of ditch |
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bald_dude43 Samba Member
Joined: May 15, 2014 Posts: 107 Location: Ewa Beach Hawaii
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Posted: Fri May 13, 2016 1:37 am Post subject: Re: At wits end |
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check your carb bowl float. Mine was doing the same thing. My float was gas saturated (damn ethanol gas) I replaced the float and no more stumble or cutting out due to fuel overflowing out of the bowl. By the way very few fuel filters will fill up when running, most of the time it is only 1/4 to 1/3 full. |
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Fiatdude Samba Member
Joined: April 20, 2009 Posts: 1218 Location: now in MO.
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Posted: Fri May 13, 2016 5:26 am Post subject: Re: At wits end |
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bald_dude43 wrote: |
check your carb bowl float. Mine was doing the same thing. My float was gas saturated (damn ethanol gas) I replaced the float and no more stumble or cutting out due to fuel overflowing out of the bowl. By the way very few fuel filters will fill up when running, most of the time it is only 1/4 to 1/3 full. |
the Float check is a good thought, but a new carb should of eliminated that issue.... If your feeling spendy, I would also replace the fuel pump as the 'new' fuels have a tendency to eat up the diaphragm causing air to be injected into the system.
My filters are usually full.... Why would your filter be trapping air in there when there should only gas being pumped through the system????
I would also think about pulling the fitting at the bottom of the fuel tank, especially on Things that have being in the dirt. There is a screen there to stop the big chunks from going thru the system and after 40 years, there is a very good chance that there is a restriction in the gas flow. _________________ Remember, as you travel the highway of life,
For every mile of road, there is 2 miles of ditch |
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Q-Dog Samba Member
Joined: April 05, 2010 Posts: 8689 Location: Sunset, Louisiana
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Posted: Fri May 13, 2016 9:16 am Post subject: Re: At wits end |
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73pumpkinthing wrote: |
Purchased a running 73. It stopped one day so I decided a major tuneup was in order. Normal plugs, wires, fuel pump, coil (replaced it already), etc.
NOW it starts good and runs good most of the time but out of the blue has this terrible stumble and shake. Replaced the carb and it did NOT help. The window of enjoying the car for the Spring is closing and I need HELP. What do I look for or replace?
The fuel filter does not fill up with fuel when running. All other parts are within specs.
Thanks |
Does the bold part mean you replaced the fuel pump? If so, with what? I would check the fuel pump pressure as some of the new fuel pumps today have way too much pressure. This could cause the issues you are having. _________________ Brian
'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle |
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ALANSD Samba Member
Joined: April 16, 2015 Posts: 341 Location: Woodstock, GA
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Posted: Fri May 13, 2016 11:00 am Post subject: Re: At wits end |
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what is the right pressure? |
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Hobug Samba Member
Joined: May 19, 2004 Posts: 220 Location: Bishop, GA
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Posted: Fri May 13, 2016 12:00 pm Post subject: Re: At wits end |
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ALANSD wrote: |
what is the right pressure? |
3 - 4 psi _________________ 73 Thing (Typ481)
76 Westy
69 Squareback auto
72 Super
63 Bug |
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73pumpkinthing Samba Member
Joined: April 04, 2016 Posts: 8 Location: mississippi
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Posted: Fri May 13, 2016 2:56 pm Post subject: Re: At wits end |
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I put a new fuel pump from the Thing Shop. Could put another one on if people thought that was wise. How would I check the fuel pressure? Fuel drains freely from the tank when the line is disconnected from the pump (gravity only).
Thanks |
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moondogi1 Samba Member
Joined: June 11, 2008 Posts: 28 Location: Lakewood, Ca.
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Posted: Fri May 13, 2016 8:37 pm Post subject: Re: At wits end |
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Did you replace the condenser? |
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SilverThing Samba Member
Joined: July 19, 2004 Posts: 810 Location: Everett
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Posted: Fri May 13, 2016 11:14 pm Post subject: Re: At wits end |
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Points and condenser was the first thing that popped in my mind. _________________ "I like how everyone likes talking about Zeke's Thing yet he's the only one that's ever seen it." - Katie
"I've seen pictures..." - Jeremy |
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73pumpkinthing Samba Member
Joined: April 04, 2016 Posts: 8 Location: mississippi
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Posted: Sat May 14, 2016 6:13 am Post subject: Re: At wits end |
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I did change the points and condenser and points are set by dwell meter. Could these work sometimes and not others? When it is acting up it still runs just roughly and then clears and runs fine until the next episode.
The new carb is running rich and can't seem to adjust it much.
thanks |
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Fiatdude Samba Member
Joined: April 20, 2009 Posts: 1218 Location: now in MO.
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Posted: Sat May 14, 2016 9:25 am Post subject: Re: At wits end |
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I've got a question --- Is that carb brand new or just new to you???? _________________ Remember, as you travel the highway of life,
For every mile of road, there is 2 miles of ditch |
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Q-Dog Samba Member
Joined: April 05, 2010 Posts: 8689 Location: Sunset, Louisiana
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Posted: Sun May 15, 2016 8:18 am Post subject: Re: At wits end |
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73pumpkinthing wrote: |
I put a new fuel pump from the Thing Shop. Could put another one on if people thought that was wise. How would I check the fuel pressure? Fuel drains freely from the tank when the line is disconnected from the pump (gravity only).
Thanks |
Use a mechanical pressure gauge on the line between the pump and the carb. _________________ Brian
'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle |
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doublecanister Samba Member
Joined: September 23, 2008 Posts: 1184 Location: Richmond, Va
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Posted: Sun May 15, 2016 5:02 pm Post subject: Re: At wits end |
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That problem sounds very familiar to a issue I had a few years ago doing
a short day trip, going up a mountain no less the THING started bucking, had no power under load, at idle ran fine.
Turned out to be a big "buggar" of 'pre ethanol' gas tank sealant (which turned my fuel purple) and lots of rust which passed the fuel filter and got in the carb, it was plugging the tank screen/ which was starving the engine for fuel.
Try bypassing the gas tank with a gas can instead that's known clean.
I actually put one in the back seat and ran a long hose into the engine bay.
(that was BEFORE) I pulled the fuel sending unit and looked in the tank with a good flashlight. Just be careful you'd be putting your face right over the hole that's probably full of gas!
anyways, good luck, let us know what ya find.
T _________________ ****************************************
2020 - Mustang Eco Boost [High Performance]
1973 - Thing
1966 - Mustang GT- Fastback
1951 - Ford F1 pickup Flathead V8 |
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73pumpkinthing Samba Member
Joined: April 04, 2016 Posts: 8 Location: mississippi
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Posted: Tue May 17, 2016 8:02 pm Post subject: Re: At wits end |
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The carb is new. I did as "doublecanister" suggested and bypassed the tank. There was a bit of bucking but much less, could have been fact there was more pressure from gravity.
While playing with it today I noted there were bubbles that would come thru the fuel line into the filter (clear). Should this be happening?
On subject of new carb it does not want to adjust very much, suggestions?
Thanks for all suggestions |
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Mark Lewalski Samba Member
Joined: June 19, 2010 Posts: 405 Location: Safety Harbor, FL (Tampa Bay)
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Posted: Tue May 17, 2016 9:39 pm Post subject: Re: At wits end |
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When I rebuilt my carb and did a full tune up, I used Rob and Dave's procedure:
http://vw-resource.com/tune_up.html#idle
It worked wonderfully for me and this will help you identify all the correct parts of the carb:
http://vw-resource.com/carb_41.html
Your new carb should be easy to adjust correctly. Perhaps you need to adjust it in relation to the timing, etc. as detailed in the tune up procedure.
Also, my fuel filter only fills about half way when the engine is running.
Good luck.
Mark _________________ '89 Vanagon GL Wolfsburg "Bluestar" (given to and owned by my son now)
'87 Vanagon Weekender
'74 Thing |
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doublecanister Samba Member
Joined: September 23, 2008 Posts: 1184 Location: Richmond, Va
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Posted: Wed May 18, 2016 9:36 am Post subject: Re: At wits end |
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73pumpkinthing wrote: |
The carb is new. I did as "doublecanister" suggested and bypassed the tank. There was a bit of bucking but much less, could have been fact there was more pressure from gravity.
While playing with it today I noted there were bubbles that would come thru the fuel line into the filter (clear). Should this be happening?
On subject of new carb it does not want to adjust very much, suggestions?
Thanks for all suggestions |
Hey 73pumpkinthing, that's a good sign that bypassing changed it a bit.
Not sure if gravity would do much for fuel pressure.
Do you think you have trash in the tank (which now) may be in the carb?
Honestly I've not mucked with fuel pumps or pressures yet.
I had to pull the top off my carb and get the rust particles out of it when I found out it was getting rust particles thru the fuel filter. Did this twice actually.
And sometimes You wouldn't think its the carb "cause it's new" but new stuff can be bad.
anyways
I have one other idea...
not tried this myself but can you run a small fuel tank and hose to the carb
(and bypass the fuel pump). Prob cant drive it this way but could run test it. not sure it would help. gravity would feed the carb.
if it still bucks, (in this test) it's the carb,
either it's clogged, or the anti-dieseling solenoid maybe? Mine was dirty and it wouldn't idle for squat.
But, this problem is sounding like fuel starvation.
That's best guess from what I'm reading and have experienced.
Please keep us in the loop. I hope figure it out.
T _________________ ****************************************
2020 - Mustang Eco Boost [High Performance]
1973 - Thing
1966 - Mustang GT- Fastback
1951 - Ford F1 pickup Flathead V8 |
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Rev. Scott Samba Member
Joined: June 04, 2006 Posts: 770 Location: Philo, Ca.
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Posted: Wed May 18, 2016 6:59 pm Post subject: Re: At wits end |
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My thing would cut and miss up a dirt road everyday. I'd stop and it would just hum. Drove me bonkers. Turned out the ignition fuse was a bit loose. Sometimes its just the dumbest thing. _________________ "I haven't seen one of those since I was shootin' at 'em!" |
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