I can't seem to be able to keep Gladys running. I have a Carter RBS 1 Bbl on there (original). I have pulled it apart and cleaned out the return jet, all orifices, and the float bowl. I have cleaned out the lines. I have a new filter in the pump and added an inline filter. I have a confirmed 4.5 psi at the carb inlet. I can get it to squirt gas and then fire up, then it won't stay running. Either clogging the primary squirter or else starving out the float bowl.
Help!
Floats filling up with gas? how did they look on float spacing? Check the condessor as well.
In reply to wearymicrobe:
The float is a replacement nitrophyl unit, but I haven't replaced it because you can't find them anywhere. The only one RockAuto sells is for the post-70 RBS and looks way different (2 small individual floats versus an entire bowl shape float on mine).
Not sure how a sunk float would make it starve for fuel, should do the opposite. What's the application?
EDIT: And as always, most fuel problems end up being ignition problems.
In reply to BrokenYugo:
New points, condenser, rotor, cap, plugs, wires, and coil. I have good spark at the plug. I can physically see the carburetor stop spraying fuel.
Fuel pump dying on extended runs?
In reply to 4Msfam:
Still have pressure at the carb inlet after it stops running.
Sounds like you're only getting fuel through the accelerator pump. But not through the venturi's. This means your bowl has is filling most likely.
Try pumping the pedal twice, then holding it about half throttle, see what it does. If it fires for about 10 seconds then dies, you've either got your mixture turned to full lean or a clog in there somewhere. Doesn't look like much by way of adjustments in that model. Just mixture, idle speed, and float height. Even super rich should still run at a high RPM, just run like crap and stinky.
Your choke closed when cold? If not, try manually moving the choke closed and the idle cam to a fast setting, and see if it fires without touching the throttle. Maybe a squirt of starting fluid down the throat to fire it off and generate enough vacuum to draw fuel through the carb.
Speaking of vacuum, any big leaks? Too much of a leak and a carb won't draw fuel.
Sometimes if a carb is too far out of whack, you just need to break it down all the way and follow the factory baseline procedures. I'm sure you've already seen this link, or similar stuff, but here's one I found specific to the RBS. It has the full overhaul procedure in it.
http://www.carburetor-parts.com/Carter-RBS-Technical_ep_305.html
Can you keep in running with the accelerator pump?
BrokenYugo wrote: Can you keep in running with the accelerator pump?
No
Do you have a way of monitoring fuel pressure during these start attempts?
EDIT: I'm thinking fuel pump (even if everything else is clogged, if it's getting fuel like it should I would think you should be able to keep it running with the accel pump alone) or you missed a spot during cleaning, did you use the good chlorinated Gunk stuff and confirm flow through all passages?
Ok, so fuel is not getting into the carb. There has to be a reason. Take the top off the carb and probe backwards until you find out why. Take the needle and seat out and find out if anything grew in there while you were not looking.
BrokenYugo wrote: Do you have a way of monitoring fuel pressure during these start attempts? EDIT: I'm thinking fuel pump (even if everything else is clogged, if it's getting fuel like it should I would think you should be able to keep it running with the accel pump alone) or you missed a spot during cleaning, did you use the good chlorinated Gunk stuff and confirm flow through all passages?
Ding ding ding, winner! Fuel pressure dropped to zero during cranking.
Javelin wrote: Ding ding ding, winner! Fuel pressure dropped to zero during cranking.
Another good old electrical problem!!
In reply to Hal:
Nope, that's mechanical on one this old.
You'll need to log in to post.
