Oliver 1800c runs with choke on and surges woth choke off

[vwaller]

My oliver 1800c gas will run woth choke on. It surges when choke is off. Had a 3psi fuel pump on it. Grasping at strawls trying to figure this out. Did carb rebuild kit. New inline fuel filter. Is it worth it to get a new carb for 800$ and the new pump for 300$. Any ideas please!

 

[ss55]

My oliver 1800c gas will run woth choke on. It surges when choke is off. Had a 3psi fuel pump on it. Grasping at strawls trying to figure this out. Did carb rebuild kit. New inline fuel filter. Is it worth it to get a new carb for 800$ and the new pump for 300$. Any ideas please!

Sounds like the idle circuit is still partially plugged somewhere. Surging is caused by the governor opening enough to open the the power circuit for idling.

 

[super99]

My oliver 1800c gas will run woth choke on. It surges when choke is off. Had a 3psi fuel pump on it. Grasping at strawls trying to figure this out. Did carb rebuild kit. New inline fuel filter. Is it worth it to get a new carb for 800$ and the new pump for 300$. Any ideas please!

Go thru thru carb again, sometimes they are stubborn. I had to go thru the carb on my 1550 4 times before I got it just right.

 

[scootergmc]

Well, run it with a small clean gravity fed piggyback tank directly to the carb to verify it's the carb. Same symptoms will let you know that it's 100% a carb problem. Next step, rebuild your carb again.

 

[rrlund]

Is there any chance that it's sucking air somewhere? Between the carb and manifold or the manifold and head?

 

[super99]

Spray carb cleaner,WD40 or starting fluid around the manifold and carb to check for air leaks

 

[super99]

My oliver 1800c gas will run woth choke on. It surges when choke is off. Had a 3psi fuel pump on it. Grasping at strawls trying to figure this out. Did carb rebuild kit. New inline fuel filter. Is it worth it to get a new carb for 800$ and the new pump for 300$. Any ideas please!

What kind of in line filter did you use? The little plastic lawnmower filter is too small. You need a larger one. I get mine from Napa

 

[rrlund]

Spray carb cleaner,WD40 or starting fluid around the manifold and carb to check for air leaks

A little safer way is to take one of those little propane torches and slide a piece of hose on it. Turn on the propane but don't light it. Move the hose around near the gaskets. If it revs up, you have a leak.