Ford 3000 gas will not start

FLHX09

New User
i have a ford 3000 it backfired thru the exhaust and died. i hit it with starting fluid and it would run on that and then take off. after a few rounds in the field this happened 3 more times. then would not hit on starting fluid. i went and replaced the points condenser wires and plugs. no help. i then took off my Holley carb and replaced it with a zenith carb. no help. plugs do not seem to be wet as i think they should be.
I have 90 plus compression on all 3 cylinders low but equal
i have spark when i lay the plugs on the intake and watch them while cranking.
I have gas to the carb and after cranking with the choke on gas runs out of the carb intake.
valves have no broken springs ect.
any help will be appreciated as i am in need of this to finish fertilizing.
 
It seems puzzling. One suspect is the ignition switch, the other is the live wire going into the distributor. Could have an intermittent break or short. Check with ohm meter. It is possible the coil is defective, they fail after a while when warmed up, but work when first started.

A different brand tractor I had, would collect sediment in the carb which would sometimes cover
the gas flow into the main jet. A by-product of the fuel. Cleaned it out and worked good again.
 
(quoted from post at 10:48:31 05/08/19) It seems puzzling. One suspect is the ignition switch, the other is the live wire going into the distributor. Could have an intermittent break or short. Check with ohm meter. It is possible the coil is defective, they fail after a while when warmed up, but work when first started.

A different brand tractor I had, would collect sediment in the carb which would sometimes cover
the gas flow into the main jet. A by-product of the fuel. Cleaned it out and worked good again.

it is very puzzling. i have been wrenching for 40 plus years on every thing that moves and i can not figure this out. I have a new carb and plenty of gas. also a new coil which i think i mentioned. I am curious if the lower compression wouldnt allow it to pull the gas. it should how ever hit on starting fluid regardless.
 
(quoted from post at 11:51:44 05/08/19)
(quoted from post at 10:48:31 05/08/19) It seems puzzling. One suspect is the ignition switch, the other is the live wire going into the distributor. Could have an intermittent break or short. Check with ohm meter. It is possible the coil is defective, they fail after a while when warmed up, but work when first started.

A different brand tractor I had, would collect sediment in the carb which would sometimes cover
the gas flow into the main jet. A by-product of the fuel. Cleaned it out and worked good again.

it is very puzzling. i have been wrenching for 40 plus years on every thing that moves and i can not figure this out. I have a new carb and plenty of gas. also a new coil which i think i mentioned. I am curious if the lower compression wouldnt allow it to pull the gas. it should how ever hit on starting fluid regardless.
my hope of joining this site was that i would get more help thane one reply?
thank you anyway
 
The compression specs for a gasoline 3000 engine is between 115 and 150 psi with no more than 25 psi variance between them. Your 90 psi is more than 10% below the minimum recommendation. Was it running with the compression that low, or did you not check it until after it would no longer start?
 
(quoted from post at 12:05:40 05/09/19) The compression specs for a gasoline 3000 engine is between 115 and 150 psi with no more than 25 psi variance between them. Your 90 psi is more than 10% below the minimum recommendation. Was it running with the compression that low, or did you not check it until after it would no longer start?

I did not have a base line until after it stopped running. so i only can assume it was running at the 90ish before the backfire started.

thank you for your help
 
Another question. Was that a dry compression test? If so, try squirting a little oil into each cylinder and re-testing wet.
 
60 I found to be the limit on a 172 red tiger. I am wondering if it jumped time? Bring it up on TDC and see were rotor points. Clue is the backfire.
 
(quoted from post at 16:27:33 05/09/19) 60 I found to be the limit on a 172 red tiger. I am wondering if it jumped time? Bring it up on TDC and see were rotor points. Clue is the backfire.
i did this and as long as the 1st hole is the one closest to the radiator i am looking good on this.
thank you
 

perhaps do you have a good way of locating a manifold leak when it is not running? I like to spray either while running and see if RPM's pick up. i am not able to do this test right now.
thank you
 

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