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Coupster won't run properly!!

Hey everybody! In preparation for the meet in Medesto, we have started to take a more in depth look at the Coupster after it decided to suddenly die on us in Orillia. Anyways, digging into it we have found that it gets way too much gas and is only running on 2 cylinders. The rear 2 cylinders closest to the firewall seem to load up with fuel and the front cylinders seem ok. We have a new distributor cap on, rotor, condensor, and new points. Anybody have any ideas or maybe a similar problem? We would like it have it fixed for before the meet!

Where Are You From? Thunder Bay, Canada

Do You own a car built by Durant? Yes, a Star Coupster

Re: Coupster won't run properly!!

Without any info on your present equipment, obtain a good Model A carb, re-rig the controls and come on down!

Where Are You From? Texarkana, TX

Do You own a car built by Durant? Several

Re: Coupster won't run properly!!

Actually, we had tried that with no real difference. We found the problem and it is the vacuum line. It is dumping fuel into the intake manifold and flooding out cylinders 3&4. Once that is fixed I think the Coupster should be good to go!

Where Are You From? Thunder Bay, Canada

Do You own a car built by Durant? 1925 Star Coupster

Re: Coupster won't run properly!!

Kyle,

Yes, If your vacuum tank valve fails to switch at the top of its cycle, like you say, it will flood the engine with raw gas through the vacuum line...If it fails to switch at the bottom of the cycle the engine will run out of gas.

Where Are You From? Leavenworth, WA / Yuma, AZ

Do You own a car built by Durant? several

Re: Coupster won't run properly!!

Hi Kyle:
I had the same problem with my '22 Star. I traced it to the vacuum tank, took it apart two or three times and found nothing wrong. Took to the restoration shop that I work with, after two or three days they found a hair line crack in the seam where the two halves join together. After they repaired it, put it on the car and it works fine. Just made sure that the float floats and doesn't sink. If the float sinks then it is in the float. Hope this helps. See you in Modesto in about three weeks.
Bert

Where Are You From? American canyon cal.

Do You own a car built by Durant? Stars

Re: Coupster won't run properly!!

I had a similar problem, though mine would not run at all. My issue was the seat for the valve in the top of the vacuum tank where the line from the manifold connects. The seat had become loose in the top housing, so even when the vacuum tank became full of fuel and the float rose and the valve closed against the seat, it could still draw vacuum round the loose seat in the housing. Thus it never sealed and just sucked fuel directly into the manifold, providing a way to rich mixture for it to run.

Took a while to find this. I pulled way to much other stuff apart looking for the problem.

I fixed mine by glueing the seat back into the housing with some medium strength threadlocker. It is fuel resistant.

Had no further problems since it was repaired this way.

Where Are You From? Down under

Do You own a car built by Durant? D40

 

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