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Donnie strickland
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Joined: December 21, 2009
Posts: 237
Location: Riverside, AL
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 Posted: Tue Jun 26, 2012 6:01 pm Post subject: |
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I once had my Bug quit due to lack of gas at the pump. The inline filter was not clogged, but boy the outlet in the bottom of the tank was. The rust flakes were too big to go thru the "sock" filter in the tank, so they never made it into the fuel line...which was good in a way, because the fuel line didn't get full of trash.
I mention this because it is easy to suspect the pump when it's actually ok. Be absolutely sure you're getting plenty of gas to the pump, and then check the pressure. |
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candymustang66
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Joined: April 24, 2012
Posts: 2352
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| Posted: Tue Jun 26, 2012 7:11 pm Post subject: |
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could be lots of things
after all you never discovered why it failed.
loss of engine compression, (valve lash ignored?)
loss of spark there are very easy tests for this.
loss of fuel (that is what vapor lock is , raw fuel not making it to the carb)
this is seen as a dry float bowl. not at the spec 19.5mm level.
running non stock fuel lings and filters in side the engine bay (wrong)
flooding, are the spark tips black and stick for raw fuel, flooding
bad choke, see flooding..
i say, take it in for diagnosis. then take appr. actions.
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back to jeeps, my true love... I-6's
finding vw parts that are not junk (even new) , is way too hard!
mines done, and selling 68T1 with no paint. (primer)
Last edited by candymustang66 on Wed Jun 27, 2012 9:01 am; edited 1 time in total |
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dan macmillan
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Joined: October 19, 2003
Posts: 3062
Location: Northern Ontario, Canada
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| Posted: Wed Jun 27, 2012 3:06 am Post subject: |
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What is the ambient temp and humidity when this happens? Do you have a single carb? What exhaust and are your heat riser tubes clear? Aftermarket exh systems do not allow for proper operation of the heat riser system This could be a carb icing issue.
_________________
Licensed Automotive Service Technician
Licensed Truck and Coach Technician
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Alignment specialist
66 Modified Manx,68 Kyote,74 Thing,74 Beetle, 76 Transporter,75 self made Double Cab,65 Meyers Manx,78Westy,68 Ghia, 79 Bradley GT2
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Built for others:69 Manx Clone |
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bugninva
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Joined: December 14, 2004
Posts: 8888
Location: sound it out.
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| Posted: Wed Jun 27, 2012 7:44 am Post subject: Re: Vapor Lock? |
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| JSalzillo wrote: | | I drove my car to work again today and right after I got off the highway, she died. Although I didn't smell gas, I did smell what I thought was a fuse or wire or ?? I tried to start her but she wouldn't turn over. After calling AAA, he had a can of starter fluid on him so we sprayed that into the carb and she started right up. This is the second time she has done this in three days. Could vapor lock be an issue? I can pump the gas all I want but she is not getting gas, the filter is empty. I don't smell gas at all and the pump is new. Could it be the sending unit? Any ideas would be greatly appreciated. |
yes, it could be vaporlock, it even sounds like vaporlock... usually vaporlock on these cars are a sign you are running a bit hot at spead... did you make it just a short distance after exiting the highway? In my experience that is the case if it is vaporlock... at speed the fuel moves fast enough to not turn to vapor, but once you exit the highway it does and you run the floatbowl dry and stop.. the starting fluid showed that it is fuel related... usually it happens at or just before the fuel pump. is your fuel line touching your intake manifold at the left side head? this is common when vaporlock happens. when it happens again pop off the aircleaner and look down the carb while opening the throttle, do you see fuel from the accellerator pump? if not, you can loosen lines at the fuel pump to see if you have fuel there... I must ask you to be careful doing so, as spilling gasoline on a hot engine is not a recommended action.... Before you do any of that, look at your engine... are there any gaps or missing tinware? is the engine compartment seal in place and in good shape? Missing pieces and seals may not seem like a big deal, but they are to your engine...
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JSalzillo
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Joined: August 26, 2008
Posts: 35
Location: CT
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| Posted: Wed Jun 27, 2012 11:32 am Post subject: |
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| Bugninva, thanks for the reply. I can answer that the fuel lines DO touch the exhaust on the way to the pump and the fuel filter is directly in back of the distributor. How and where should these be run? Also I noticed that the gas cap was loose even when on tight. The rubber seal on the inside of it is thin and loose. I am getting another one of those. |
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bugninva
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Joined: December 14, 2004
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Location: sound it out.
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| Posted: Wed Jun 27, 2012 11:43 am Post subject: |
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| JSalzillo wrote: | | Bugninva, thanks for the reply. I can answer that the fuel lines DO touch the exhaust on the way to the pump and the fuel filter is directly in back of the distributor. How and where should these be run? Also I noticed that the gas cap was loose even when on tight. The rubber seal on the inside of it is thin and loose. I am getting another one of those. |
there is a hole in the left side of the front compartment tin that the (metal) fuel line ran through from the factory(had a rubber grommet, very important, more on that later if you need the info), from there it went above the left side head and next to the left side intake section. then turned back to rubber(is rubber from tunnel outlet to the mentioned metal tube) to connect to the fuel pump. The fuel filter is another touchy and controversial subject, but that is for a different time, lets get your problem diagnosed first... 
how is the engine compartment seal? is it intact and complete?
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| EverettB wrote: | | I prefer to refer to everyone as my "bitch". |
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JSalzillo
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Joined: August 26, 2008
Posts: 35
Location: CT
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| Posted: Wed Jun 27, 2012 11:53 am Post subject: |
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| The engine seal is in good shape. Keep in mind that the car is 40 years old so some of these replacement parts have been a long time coming. The ONLY reason I am thinking it is a fuel issue is because after I replaced the new fuel pump with the old one, the car started right up and I now have fuel going to the carb. I am willing to do some diagnostics on the car, but some of this uber-scientific stuff is way over my head which will only result in failure like candy said. I would like to focus on the proper routing of the fuel line and filter. |
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bugninva
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Joined: December 14, 2004
Posts: 8888
Location: sound it out.
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| Posted: Wed Jun 27, 2012 11:57 am Post subject: |
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that is the best course in my opinion. The suggestions I offered are very non-scientific and easy enough to do... I suffered from vaporlock in the past and it happened as you described... when I would pull the line from the tank, at the fuel pump, no fuel flow... was vaporlocking at the left side intake.. I insulated the metal tube with a piece of larger rubber fuel line and that went away... then later I fixed the real problems, some open holes in the tinware and a seal in need of replacement... that's why I ask about those things first, it seems most that suffer from true vaporlock are actually overheating a bit and the vaporlock is just a symptom of that... the folks in this thread already are more than enough to help you get to the bottom of this... lots of knowledge around.
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JSalzillo
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Joined: August 26, 2008
Posts: 35
Location: CT
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| Posted: Wed Jun 27, 2012 12:10 pm Post subject: |
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By the way CandyMustang, my original post suspected a fuel issue from the beginning. I pulled the air filter off and saw with my own two eyes that the carb was not getting fuel. I appreciate the time and effort you have put in to your responses, but I think an over analysis for a certain issue was given. I work with guys that over analyze things everyday when a simple approach could be made. I was told once by many other VW people that usually an issue simple and often overlooked. These car are not very technical so by giving a long explaination, I think the waters are being muddied..........at least for me.  |
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BrainFartHeadache
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Joined: August 14, 2010
Posts: 56
Location: Michigan
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| Posted: Wed Jun 27, 2012 8:09 pm Post subject: |
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I have had the same issues with mine for 2 summers now. so many things i tried from tank venting to snaking the fuel line, new pumps, carb, insulating fuel line, getting the pump to the correct psi, filters, bay seals and such. The cure was to finally put an electric pump up by the tank, therfore pushing the fuel to the back, vaporizing or not it's still gonna get the gas to the carb. I have not had that issue since install so i'm pretty happy with the results.
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bugninva
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Joined: December 14, 2004
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Location: sound it out.
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| Posted: Wed Jun 27, 2012 9:52 pm Post subject: |
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An electric pump will surely cure the dying out due to lack of fuel, but as I said previously, the vaporlock is usually a symptom, not the actual problem.
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| EverettB wrote: | | I prefer to refer to everyone as my "bitch". |
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JSalzillo
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Joined: August 26, 2008
Posts: 35
Location: CT
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| Posted: Sat Jul 07, 2012 12:47 am Post subject: |
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| We found out that the fuel pump push rod was short by about 1/8 of an inch. It wasn't the wrong one but it looked like the end of it was missing. I have since replaced it and rerouted the fuel line the correct way with all new hoses and line. Thanks for the input everyone. It looks like it was something overlooked again on these things. |
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candymustang66
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Joined: April 24, 2012
Posts: 2352
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| Posted: Sat Jul 07, 2012 8:13 am Post subject: |
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ouch, it was damaged push rod..... glad you go it sorted !
_________________
back to jeeps, my true love... I-6's
finding vw parts that are not junk (even new) , is way too hard!
mines done, and selling 68T1 with no paint. (primer) |
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