I have a 360 in my CJ. I bought it with the 360 in it but it had issues. I sent the engine out and had it mostly rebuilt. I finished assembling the front of the engine and the intake and exhaust manifolds. At the time, I wondered why the original fuel line was in such a zig-zag pattern. I put more of a direct ''up from the fuel pump, right turn, straight over and into the fuel filter and direct into the carb.'' Now, when I go ANYWHERE, the fuel must drain back from the carb down the line. And if I park on an incline, the fuel must drain back farther. I changed the fuel pump, thinking that it may help but it did nothing. When I start it after the fuel drains back, I get a substantial amount of smoke from the tail pipe. (The builder assured me that the valve stem seals were top-notch, high quality and oil was NOT getting by them) First things first. I need to fix the fuel line back to original. I need to find one existing so I can copy it. I'm still concerned about the oil burning issue - I'm still now sure why it's doing that. Any help with the fuel line or oil burning issue?
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Re: Fuel supply on 1976 CJ-7
Large amounts of unburnt fuel is most likely what your seeing in the exhaust at first start up.Have you had the carburator rebuilt?Pull your plugs before you start it and look and smell for unburnt fuel.This may be solved by leaning the carb out or replacing or adjusting the float/needle valve,and check all the fuel line connections.As far as the fuel supply line shape this is not a problem,a good fuel pump and supply lines should not lose it's prime and not allow the fuel to drain back regardless of shape or routing.
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You will have to determine if the vehicle has spark as well as fuel pressure. Pull a plug wire off and ground it over the engine. Crank the engine and it should spark. If spark is ok, you will most likely have a fuel supply issue. You will need to hook a fuel pressure gauge to the fuel rail test port to determine if pressure is available. If no pressure suspect a fuel pump or power/ground supply issue to it
Sounds like a fuel supply problem. The fact that it does momentarily start, indicates its not an electrical issue. However, no steady fuel supply to the injectors and it won't run for more than a second or tow. Your problem is in the fuel delivery system most likely. Either the pump, or (if the unit is located in the fuel tank) the fuel filter may have ruptured. That would sent all the fuel back to the fuel tank not to the injectors.
If you have spark at the right time, compression, and fuel, you should have combustion. Was it running before you had the work done ? Is it possible the distributor timing is off ? You know for sure the plugs are firing, not just the coil ? And the accel pump in the carb is spraying gas ? And the choke is closed ? A major vac leak like the PCV valve hose or intake gasket could keep it from starting.
is your truck running ritch? bad smell from tail pipe try a carb rebuild kit or newly rebuilt carb also check your timing if the timing bounces and cant be timed to speck change the timing chane good luck CJ
You are not getting enough of one or more of the following;
See possible causes and fixes below
-If carburated, may need to be rebuilt, no way to tell w/o dissassembly and looking at valves/jets
-If fuel injected, injectors could be dirty or malfunctioning, are they old?
Q - does engine run smooth at any speed? If not, not all cylinders may be firing
2. Air - is air filter clean? Is there debris in air box?
3. Spark - does engine sound like all cylinders firing? If so, spark should be fine. But have you checked plugs recently? Changing all plugs, especially b/c V8, could really help Check for gap and corrossion/wear patterns to ascertain engine/cylinder running conditions. If you are unsure how to read plugs, then brush up on the subject (like I have to).
4. Vacuum - MOST OVERLOOKED ISSUE in general engine work, all engines require vacuum to run various valves and components, vacuum leaks are more easily tested using gauge, bought/borrowed or performed in shop.
Check all these things, maybe fuel filter, too.
Special note: there is a chance if you have run tank (or someone else did) to empty repeated times that debris from tank has built up in fuel pump's internal filter, which is before fuel line filter. Only by removing and inspecting pump can this be checked. Inspect all previously mentioned items, then check fuel pump. If all that doesn't work, then give me a terrible grade and repost and I'll try again...