A few thoughts…JamesCalvinIII wrote:Mon Apr 24, 2017 2:49 pm
Okay so I repaired the fuel lines, they hold pressure fine,
but I'm not getting fuel to the carbs,
It was working a few weeks ago then died out
I have a fuel filter behind the rear drivers tire, I can physically suck gas from the tank to where the line meets the fuel filter but when every things connected it won't pull fuel to filter.
The fuel pump probably only has about 5 miles on it, My guess is a faulty fuel pump, even though its brand new... is there any way to test it?
I suppose there is a possibility of a faulty fuel filter that is permitting a vacuum leak and preventing fuel from being drawn into and past the filter. The filter may also have some directional arrows on the side. You should be sure that the filter is installed correctly, with the arrows pointing in the direction of fuel flow. However, for testing purposes you could simply bypass the fuel filter by removing it from the line and connecting the fuel pump directly to the incoming fuel line.
You mentioned that your Corvair has been sitting for several years. Have you drained the stale fuel from the fuel tank? You should never attempt to start your Corvair with ancient gasoline.
You can also bypass the fuel tank and fuel line from the tank to the engine compartment by running a length of fuel hose directly from the steel line where it enters the engine compartment to a gas can that contains fresh fuel. The gas can should be positioned away from any source of ignition, but several feet of hose should not be a problem for the mechanical fuel pump.
As I mentioned in my earlier post, you should confirm that the fuel pump bolt pointed end is properly seated into the conical hole in the side of the fuel pump shaft. This ensures the proper positioning of the pump so that receives a full stroke from the pushrod as the engine is being cranked or when it is running. If the pump is not properly seated and is held in position incorrectly a short stroke may prevent the pump from pumping efficiently to develop the vacuum needed to draw the fuel to the pump so that it can be pressurized and fed to the carburetors.
You mentioned originally that the fuel pump had failed. But if the fuel lines between the gas tank and the engine compartment had become cracked and were leaking it is possible that the original fuel pump was actually not faulty. It could have appeared to have failed when in actuality a vacuum leak may have formed in the fuel feed line from the gas tank, making it impossible for the fuel pump to do its job. Do you still have the original fuel pump? If you did not throw it out you could try reinstalling it to see if it will function once again now that the fuel inlet line has been corrected.
If you do not have the original "faulty" fuel pump to try again, it may be necessary to obtain another replacement pump. You might try ordering a new pump from a source like Clark's Corvair Parts, since they are well aware of problems that have occurred in the past with poor quality control from suppliers. The pumps they provide MAY have a better chance of functioning properly when installed. It is possible that the new pump you have currently installed could have failed after only a short period of use.
The shop manual pages that I posted earlier shows how to test the fuel pump for proper operation. A vacuum/pressure gauge can be used to confirm that adequate fuel pressure is being delivered by the pump. A container can be used to measure the amount of fuel delivered within a specified period of time to confirm proper volume capacity.
I hope the one or more of these suggestions will be helpful. Good luck with your testing, troubleshooting and fault isolation. Please let us know what you find.