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i have a 67 bug. the car starts up just fine. when i shut it off and let it sit for awhile it wont start back up. it tries to turn over but just wont fire. i put a new carb. and fuel pump in but, have the same results. now thinking it might be an electrical problem. any advice would be great. thank you.
My first thought is...since you have installed a new carb....that the choke isn't adjusted properly.
HTH,
- Nick
Don't shut it off.
There, I fixed it for you.
Ok, now that I've had my fun...how old is your coil. Sometimes they'll crap out once up to operating temperature and won't refire until cool again.
You want to do some diagnostics when the car is acting that way - are you getting healthy spark? Gas? Timing properly set, etc?
Welcome
How long since good tune up including valve adjustment? How are the plugs, not platinum? Points,etc.?
new coil. tune up a few months ago. points are good. ill try plugs.
Before you go crazy replacing parts, do some diagnostics. Get it into it's "I don't wanna start" condition then check to see if you're actually getting spark. If the spark is healthy then you know you need to look elsewhere for the answer.
have good spark. im at a loss here.
I'd check the timing next, and after that, look for possible vapor lock.
have good spark. im at a loss here.
Did you read my post above?
- Nick
I'd check the timing next, and after that, look for possible vapor lock.
I am curious about vapor lock. How would one release pressure once the the carb was installed.
how would you check for vapor lock?
and choke is set.
and choke is set.
A little bit more history regarding your Beetle might be helpful:
- Is this Beetle "new" to you...or have you had it for a while?
- If you've had it for a while...how was it running before you installed the new carb. & fuel pump?
- Why did you install a new carb.?
- Why did you have to install a new fuel pump?
I could "guess" at why you replaced these parts...but I would probably be wrong not knowing if you just got this Beetle or if you've had it for a while. Since the only parts you replaced are the fuel pump & carb. (and assuming that your Beetle ran ok or relatively ok before)...then the problem would seem to lie with one of these two parts.
The fuel pump is relatively easy to replace (assuming you installed the correct fuel pump, and have the correct length fuel pump push rod). A new carb. can be more difficult depending on:
- What carb. you installed...since we cannot assume that your 67 Beetle still has a stock engine in it, if it has the stock intake manifold, if it has the stock distributer (you didn't tell us).
- Not knowing what carb. you installed...would depend on what sort of vacuum signals it needs...and thus this can also relate back to the proper distributer.
- if the choke is correctly adjusted
- if the idle screw is properly adjusted
- if the bypass screw is properly adjusted
- if the carb has an electric choke on it...and if it's getting power
Then we get into some other things other members have suggested:
- plugs
- ignition wires
- points & condenser
- timing
- valve adjustment
- fuel filter(s)
- air filter
- plugged pre-heater tubes
- etc. etc.
So as you can see...giving us only a few details such as...installed new carb. & fuel pump...and engine won't run...leaves us with allot of room for guessing. Plus you said that the car starts up fine...but when shut off & it sits for a while it won't restart.
What does "starts up fine mean"? After it starts...how long will it run? Long enough for the engine to completely warm up?...Long enough for the choke to fully open?
Details...need more details.
Just trying to help, 
- Nick
so today i replaced wires cap rotor. did the timing again. tightened connections to regulator. has been firing up every time now. id like to thank everyone for there time and input. i will repost my results tomorrow after letting it sit. thanks again.
morgan.
debgdr, vapor lock occurs when the fuel in the lines is more or less boiled off, or vaporized. Thus, it's not really a pressure issue, as there are no check valves in the system (if you don't count the needle/seat in the carb). It's more a lack of prime to the fuel pump kind of deal, as the pump and carb are designed to work with liquid gasoline, and supplying gas vapor to the float bowl doesn't work very well, as VW's have no way to vent from the feed line to the carb or from the fuel bowl, and both of those plus the fuel pump are already being heated due to their location. Keeping your fuel lines off of the engine tin, exhaust, etc. is usually enough to prevent vapor lock, however.
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