There is gas to the Carb. If gas is poured in carb, engine will run for a few seconds. Have tapped on carb to see if it is stuck, no help though. I see there are two solenoids on the carb. What are they? Thank you.
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Re: 85 Chevy Nova won't start.
Thats your throttle body injection do you have enough fuel pressure to carb? its possible you have a failure with the throttle body if you have good pressure to the carb. Need to check pressure before you can go further.
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the needle and seat in the carburetor might be stuck shut. Pull the fuel supply line off of the carburetor and unhook the coil wire, so the engine will not fire, crank the engine and make sure the fuel pump is pumping fuel to the carb. If there isn't fuel getting to the carb then you will need to look elsewhere, like maybe the sending unit in the tank. But if you do have good fuel getting to the carb then it is probably the needle and seat in the carb.
This truck is fuel injected, the problem sounds like a weak fuelpump, it runs when you pour gas into it until that gas runs out, the first thing is to test the fuel preasure, if the pump is weak it may run with gas poured into it but wont idle, also a common problem is the coolant temp sensor and the ground wires to thermostat housing bolt but i wont bet its the pump inside the fuel tank, if you put a fuel gauge on it there should be at least 55-61 psi if its a few pounds lower it can cause problems, you have everything else and it runs with gas poured so its a fuel problem check the preasure, theres a valve up top on the fuel line to connect a fuel gauge to it, start there hope this is helpful.
It sounds like the float inside the carb is stuck. For an immediate fix, I've read that you can tap lightly on the side of the carb with the plastic/rubber handle of a screwdriver to loosen the float. However, in my experience with my '72 Cutlass, the issue will reappear (it's getting stuck due to gunk in the carb) and could cause an engine fire --imagine the gas pouring onto a hot engine block. It's time to rebuild/replace the carb.
It sounds like it's not getting fuel. Are you in a cold climate? The gas line could be frozen. You can check the fuel pump by disconnecting the gas line at the carb, you may want to put a length of hose on the line and catch the gas in a coffee can. Then have someone crank the engine while you watch to see if gas squirts out of the line. I wouldn't use too much starting fluid, you can damage your engine, pour a little gas in the carb instead. Also, on a truck of that age the gas line could have a hole rusted in it between the tank and the fuel pump. If that's the case the pump will not pull the gas out of the tank it will draw air instead. It could be the fuel pump itself. If you have a good stream of gas to the carb then the problem is in the carb. It could be the needle valve is stuck shut, take a screwdriver and lightly tap on the carb, that will sometimes jar the needle loose. If you have gas to the carb it could also be clogged jet inside the carb. I you hold the choke partialy closed will it stay running then?
If you have fuel to the carb but it isnt delivering it to the engine, that can be due to a few conditions.
1. your needle valve or float could be stuck. next time you take off the fuel line, try spraying some carb cleaner into the inlet then GENTLY tap on the bowl. That may free it for the time being.
2. your jets are clogged which wiould require you to dismantle the carb and at least clean it well inside.
A carb repair kit is inexpensive and dont be afraid if you have left over parts (you will) a complete carb rebuild is only for skilled technicians. You just want to take it apart and give everything a good hosing with carb cleaner, put the new needle valve in and gaskets on and reinstall.
Lucas oil products makes great fuel cleaners once you have it running again
I would change gas brands, it may be an additive they use, have seen this before on my own car, a 1973 NOVA, I went to a carb shop they sold me a Viton rubber pump, changed gas brands installed the pump and problem went away.