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Most remote purge bulbs have two connections one long one short, the thing to remember is the bulb pulls fuel from the carb into the bulb and back to tank, the short connection is the suction side so goes to the carb, the long connection is the pressure side so goes back to the tank, get it wrong and you will just flood the carb.
1) check valves inside the primer plate is sticking
2) fuel pump diaphragm is varnished and flaps are sticking to the body of the carb
3) the cost of parts and time spent are more than a new carb
4) new carbs are updated versions and have updated ethanol resistant components
** suggest a new carb, it will solve several performance issues
The bulb is connected to the fuel and carb by two small hoses usually clear or yellowed from fuel..they get brittle and break causing it to suck air and loose it's ability to push gas into the carb...cheap cost but is a little tricky to replace account of close clearance but can be done..if not easy fix for dealer good luck
This sounds like a fuel delivery problem. Maybe remove the carb and tear it down and then soak it overnight in a cleaner after removing all the moving parts...not real hard normally...then let dry and reassemble...If this doesn't improve the fuel delivery problem, maybe get another carb for it....Make sure the air filter is not plugged up, blocking air flow to the carb itself..just something to make sure of at first.
There are two screws on the carb. 1 is Lo rpm air/fuel ratio and the other is hi rpm. Try adjusting the lo rpm screw counter-clockwize a 1/2 turn at first, more if needed. After each adjustment try to start. The other thing you could check is if the float is sticking in the bottom of the carb. which shuts off gas flow if full. There is a screw on the bottom of the carb to drain that float. You can try that also! Good luck man!
Does your truck have a carb or throttle body?? You may have an electric choke on the side of the unit that is disconnected or might need repair. Will the car start when you prime it manually?
Good luck
fuel line wrong way round prime the carb and hold thumb over two outlets on carb feel for the one whats sucking thats the where the main fuel line goes the other one is the return to the fuel tank
when you prime the bulb it sucks gas from the tank with the small tube, any excess gassed pumped will be fed back to the carb via the big tube leading to the tank. If you prime it and the bulb stays pushed down, then you have a clog or kink. To fix , pull the small tube out of the tank through the fill hole. Pull off the filter on the end and put the tube back in the tank. If it primes, your fuel filter was clogged. If it still wont prime check the hose going to the carb and make sure isnt clogged or kinked.(take of carb and blow in it). If that doesnt fix it take off the bulb from the carb with two screws. The bulb assembly will come off too(rectange metal thing) Take off the two black gaskets, be carefull with them. Take off hoses from carb and bulb asembly. Blow carb cleaner in all holes and over surface. Put back together. If the carb wont prime and the bulb isnt staying depressed. then you might have a bad bulb or carb gaskets. Make sure hoses are not cracked, cloged, or pinched.
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