So my bus has been down for about a year due to a leaky tank. My husband and I replaced the tank last week and I drove it all week with very little trouble. By very little I mean that I drove it about 10 miles and then it randomly stalled on me and wouldn't start. I had a friend help me push the bus out of the roadway and I was going to try to see what the problem was, but it started just fine after we pushed it out of the way. I put another 75 miles on it and thought all was good that it was just a bad filter.

So last night I was driving from Chattanooga to Atlanta which is about a 100 mile drive, I made it about 25 miles and the bus lost power on the interstate. I immediately pulled over and shut everything down. I thought about what had happened before and thought perhaps it would start again. Sure enough it did.

So I get another 5 miles down the road and the same thing happens, only this time it wouldn't start back up. I ended up having it towed home as there was no way i could work on it where it was.

The bus is a stock 78 federal emission westy with all stock FI components less the EGR. Perhaps coincidence, but all three times this happened it was dark out so the lights were on if that makes a difference.

Today I changed the filter yet again and also added a clear filter coming out of the tank. We cut open the square stock filter afterward and found that there was really not much as far as debris inside it. I have pictures... but you'd get way more dirt off my parking brake handle than was in that filter. The new clear filter under the tank is showing me some clear gas. I have only driven it around the neighborhood since installing it, but since the old filter was as clean as it was I don't expect it to pick up much.

Also, when I was waiting for a tow last night I tried to start the bus probably a dozen times with no luck. AFTER replacing the filter today I tried about 6 times and it wouldn't start. Since it wouldn't start I rechecked that I had fuel pressure at the check point on the rail, rechecked my point gap and then went to check spark... when I had my husband start it for me to check the spark it started up on three cylinders.

Coincidence? Is something else really wrong here? Any ideas? I do not think that as little debris that was in the filter would cause it to stop up, unless there is something I am missing that is clogged.

i am not familiar with your vehicle at all,so this may not help any,but i worked on a old rabbit convertible for a friend of mine that suffered from the same symptoms.it was also a F/I car. it turned out to be the fuel pressure regulator.good luck

is there a way to test the fuel pressure regulator? I replaced it 4 years ago when I went through the fuel system, just because it had been sitting for 10 years... I'd like to test everything if possible before throwing parts at it

as far as i know,about the only thing you can do is a vacuum test on the vacuum side of the FPR.if you have one of those handy dandy little vacuum hand pumps.alternately,you can replace the vacuum hose with a piece of clear hose temporarily and see if is pulling fuel out the wrong side of the FPR.if you can get it to run for a few minutes.maybe someone else knows more about it and will chime in.
i have bought a FPR at advanced before for a BMW,and it went bad in about 7 mos.so, it can happen.good luck!

maybe you have some debris floating around in your fuel tank, and after a while it makes it way to the fuel line area and slows or even stops the flow of fuel, then when you shut the engine down whatever it is floats away and makes it way back round the fuel tank and does it again. Just a thought... this happened to me in my 4runner i had a while back... there was a snickers wrapper in the tank

another thought,sometimes coil issues can cause that type of problem.
if you have a pic of your FPR so i can see what it looks like,i have a couple of spare ones.if i have one like yours you can have it.

Ha Ha Ha - This is what happens when you take forever to reply.... just got beat to it....

VWGirl,
Have you thought of the Coil.
If it is old, sometimes the heat will cause them to loose conductivity as they expand. Then when they have cooled, they work again.
Just a thought. Also, did you ever get that tow hitch installed on your yellow type 3?
Thanks,
KC

Do you have points or and electronic ignition?

I'm thinking it sounds like the coil as well. Sometimes, when they get hot, they quit working.

vwgirl, could be trash in the injector or a bad injector. There is a place in Cumming that tests and cleans injectors. At this moment I can not remember the name or phone number but if you decide to get them tested and cleaned I'll chase it down for you. I believe he charges $45.00 for four injectors if you bring them to him.