QuestionHey, no i know the fuel pump has nothing to do with the compression of the motor, its just another problem. What i meant was there is about 110psi in 3 cylinders and about 30 in the other 5 so im wondering if there is something wrong with the piston rings or valves which is what i meant be seals sorry.
-------------------------
Followup To
Question -
Hey, The gas is actually shooting from the little tube the feeds the carb, right above the intake manifold. Someone told me that was due to the float or some sort of needle in the carb. Also now im getting right compression in 3 of the 8 cylinders. Is there anyway to fix this besides changing the seals? THanks
-------------------------
Followup To
Question -
Hey Mr. Benjamin, long time no speak. N e ways i have a 69 camaro with a 307, and i just finished taking it apart and cleaning it and changing the gaskets. Well got it back in and all together and when we go to start the engine turns but gas shoots out like a gyser out of the carb in spurts. THe fuel pump is the same mechanical one that was on it originally so im stumped. Gas shot on to the middle of the windshield to give u an idea. Any ideas on how I could fix this problem? Thanks, James
Answer -
Hi, James;
It sounds to me like the threads on the fuel line connection to the carburetor are cross threaded - is that where the gas is shooting from? Now that you have a healthy fuel pump, the pressure must be finding any minor leak and giving you a strong squirt.
Tell me where the gas was actually squirting from in the carburetor, and maybe I can tell you more.
Dick.
Answer -
Yes, that is exactly what I was trying to tell you. That fitting is not installed right - either the threads are crossed up, or the part is damaged in some other way. There is nothing wrong with your carburetor - the problem is that the gas line isn't sealing to the fitting on the carburetor. If you don't have a set of line wrenches for working on these lines, you probably cross threaded the fitting when you connected the fuel pump back to the carburetor. If you didn't disturb the fitting on the carburetor, and it didn't leak before, the fact that is has suddenly begun leaking is the mystery of the week! Maybe someone leaned on it and cracked the fitting. Just inspect the parts, you should be able to see the problem. It isn't inside the carburetor, it is right there at the line connection.
I don't understand what you are saying about "right compression in 3 of the 8 cylinders" - can you say it some other way - I don't know what you mean.
Did you do a compression check on the engine with a compression tester? If so, tell me what the readings were on each cylinder, and maybe I can give you some hints as to where to look. I cannot see any reason why fiddling with the fuel pump should have any effect on the internal parts of the engine.
I don't know which seals you are asking about - there are no seals involved in the compression of an engine, unless you mean the valves or piston rings - those are metal parts, not usually called seals.
Anyway, ask me again and I'll try to tell you more about it.
Dick
AnswerThe way to track down poor compression in a cylinder is to perform a leakdown test. If you hire someone to do it, it will be expensive but you can do it yourself.
Make an adaptor from an old spark plug (gut the innards out of it) so you can pump air into a cylinder by connecting it to your air compressor.
For each cylinder that you want to diagnose, turn the crank until the the distributor rotor is pointed at the plug wire for that cylinder, then lock the engine in gear (if it is manual transmission) or clamp a vise-grip on the flywheel if an automatic transmission, to prevent the engine from turning while you do the next step.
Now, screw the air injector you just made into the cylinder you are testing and connect it to the air compressor - the pressure doesn't matter, but move the compressor outside because you are going to listen for the air flowing out of the engine, and it has to be quiet to do this.
Listen at the oil filler pipe for the air hissing out, then at the carburetor, and then at the tail pipe. If the problem is rings, you'll hear the air coming out the oil filler pipe. If it is a bad exhaust valve, you'll hear the air comming out the tail pipe. If it is a bad intake valve, you'll hear the air coming out the carburetor.
With that low a compression reading, I think you are in for a major engine rebuild anyway, so probably which problem it has isn't really that important to you.
Dick
