Will not start...Why ????

Hello all

I have a problem, and maybe some of you could help. I have a 77 CJ-5 with a 258 and a YF carb. Here in Canada, it is winter with temp of around 20 to 32 F. My jeep is parked for the winter , but I try to make it run once every two weeks.

Here is the problem. During Christmas vacation, I went outside to start the jeep and maybe roll into the nearby street, but it did not start at all. So I checked if the gas pump was working, and it did. I then checked if there was gas passed the gas filter, yes there was. I looked and snif inside the carb, no fuel odor at all, as if there was no gas inside the carb.

I took a small amount of gas, putted it into the carb, and the jeep started, but stoped immediately, as if no gas was coming in the carb.

I did it again and it started, and I was able to run the jeep a little that day.

Yesterday was another great day to try the jeep, and same thing happen. The motor rotate but will not start. I tried the gas into the carb trick, but nothing.

Any idea ????


Desperate Bob in Sherbrooke, Province of Québec

 

The gas is going all the way past the fuel filter.

Can you tell me how to check if there is gas in the carb bowl ???

I'm quite new at all of this.


Thanks

Bob in Sherbrooke, Province of Québec

 

it takes both fuel and spark
need both at about the right time
as mentioned above, is it getting fuel to the carb?
if not then backtrack to find problem: filter, hose, pump, line restricted, loose clamps, etc.
is it getting spark ? battery strong ?
is the choke working properly ?
77 should have a fuel filter with the return line ( 3 ports)
the large 5/16 ports are for fuel delivery to carb; the smaller 1/4 line returns fuel to the tank.
if Jeep has this filter, the small 1/4 port needs to be placed higher than the 5/16 port; otherwise, you can possibly siphon fuel from the carb back to the tank with the engine off.
also, over two week period, the fuel could evaporate from the bowl; some after engine shutdown when engine is still warm, the rest over time.

 

with engine off and air cleaner top off, operate accelerator linkage while watching down thru the top of the carb
the accelerator pump should discharge fuel with each stroke
if the bowl is dry, it won't until engine cranking fills the bowl up
if no fuel, then the needle/seat/float could be stuck/obstructed causing no fuel to enter the bowl
removal of top of carb to peek inside might be called for as the pump discharge nozzle could be plugged from debris

 

Thanks a lot

I'll go look at this and I'll keep you posted.

In the meantime, if any of you have any more ideas, I'm open to all suggestions


Bob in Sherbrooke, Province of Québec

 

My old Dauntless is the same way, need to prime the carb a couple of times, especially when it's cold. Seems to take quite a bit to get the fuel flowing. Could be condensation in the fuel line, and freezing, blocking the fuel from the carb.

Paul

 

Well, I went outside to check all of this.

I turned the fuel filter so that the return line is higher than the one that goes to the carb. it was lower, so it might be part of the problem.

This done, I tried again to start the jeep, but nothing....

I checked inside the carb, no gas. I then filled it with a seringue, tried and it almost started.

So I remove the hose from the gas filter, and no gas was coming from the pump....so I guess that the gas is frozen inside the line. Next time I try, I will make sure that the gas is not frozen.


Thanks for all your replies, it was of great assistance.


Bob in Sherbrooke, Cold Province of Québec