Fuel Problem

Thanks for the swift reply.

Can you tell me what might cause the low-fuel-in-filter-bowl issue, along with the bubbles in the line running through the filter?

My 1970 Type 1 has suddenly developed a low power, rough-idle problem.

There is only one-way to determine the possible cause -- very 1st thing that you need to do is perform a Tune-Up. A Tune-Up will help eliminate a multitude of performance issues. A tune-up should include the following: R/R Plugs, points, condenser, rotor & cap, fuel filter and make sure you have those valves adjusted -- a common issue with most VW pancake owners -- Type I, II. III and IV's! Your valves are solid type and require that the valves be adjusted more frequently, Valve adjustments is the most overlooked & MUCH needed service! You may notice that your engine runs smoother and you may notice a performance increase as well!

BBA

First thing you want to do is get rid of the fuel filter between the pump and the carb. You are inviting an engine fire. The hose will slip off the carb when you least expect it. Secnd, the next time that happens, open the gas cap and see if you hear a "whoosh" of air. It could be that the tank vent is not working. While you are taking off the fuel filter, have someone turn it over with the new fuel line in a can and see how much flow you have. The tune up and valve adjustment is always a great Idea. You should always adjust the valves as required in the Manual. You do have one, right?

the Grokdoc Tom Malmevik all that groks is god

67 Baja marti

How do you know that the bowls are not filling up?

1st thing is to check the carburetor jets/accelerator pump function - you will need to look down the throat of the carb >Engine Off< You may require the use of a friend, a mirror and a flashlight. If no helper available! Remove the hood so that you can see down the throat of the carb. Now apply the throttle - at the very same time look down the throat of the carb -- you should see a thin stream of fuel -- if you do see a nice thin stream >> carburetors Idle valve is more than likely the culprit to your dismay.

Bubbles in the fuel line is not an issue with carb based vw's - fuel filter should be less than half full when working properly - a faulty filter will fill up with fuel!

BBA

I'm doing the tune-up as this is written--thanks again for the advice. I use both the Bentley and Muir manuals.

I'll eliminate the fuel filter immediately--makes perfect sense. There is already an inline filter just after the tank outlet.

I did the fuel cap check and there appears to be no problem with the tank vent.

I'm also going to run some solvent throught the hard fuel line in the body channel to see if the line is clogged with varnish--the car was stored for some years.

Thanks again!

Randall Brink

This does not sound like a fuel problem to me at all.

The bubbles in the filter don;'t mean anything, but it's still a good idea to get rid of the filter in that location.

I would begin looking at the ignition. Points gap. Weak spark. Initial timing. Amount of advance. Hi-voltage breakdown of coil, cap, rotor, even wires. The fact that this condition came on suddenly suggests an electrical failure, rather than something mechanical.

Speedy Jim

Thanks to all! I implemented the procedures and took the advice offered here today, and my bug is now running sweeter than ever since the installation of the new engine.

As a bonus I also was told to eliminate the fuel filter between fuel pump and carb, possibly obviating a catstrophic fire!

Again, many thanks for all the help.

Randall Brink