Spent some time to troubleshoot my low meth flow issue today. Need to get the S4 running solid before my next project shows up
So, first I disconnected and removed the pump head, inspected the rubber seals and pump.
Then blew backwards using air from the suction line of the pump, back to the tank, while watching. Of course with methanol the tank looks brand new inside, not much chance for particulate to catch in the filter here. Then I removed the three jets from the intake, blew Air from the fast acting valve to the manifold and out to a container. Then flushed through each of the 3 individual lines coming from the manifold to the intake while disconnected from the intake. Checked and flushed everything, blew air forward and backwards through all lines and was not able to find any obstructions.
Re-installed everything except ran the line from the pump to a container and jumpered the system to do a 1 min test spray, measured 600 cc/min flow. Installed the manifold and this time routed the manifold and all three jets into to the container and registered the same 600 cc/min, more than enough flow. This is the second time i have had issues with this system, and taken it apart only to find nothing wrong and put it back together. Miraculously each time it was working properly again when reinstalled. Oh well.
Did a pressure test for good measure then road tested and everything is good. Have full flow again.
Pump location:
Tank location:
Manifold/Jets:
Pump head ( AudifreakJim, which are the seals you replaced? )
Test setup:
