Ok so I have carb motors but I’m running the 2 hose EFI style thermostat housing and a recirc pump. I have high pressure that’s rpm based. I can rev up in neutral and get the pressure to jump to 30+. I decided to try a bypass from plug in from of intake to a T on riser hose. (Gil exhaust). This worked. I’m going to do all 4 to get pressure back to normal.

Now my biggest question is should I need check valves on these bypasses. I did a test run with the first bypass in and things are certainly improved. Didn’t notice anything negative but just curious if these bypasses should have check valves or will it not matter?

The white line is where the bypass hose runs. T on the Gil riser hose. Barb fitting replacing plug in intake

1/2 inch hoses. I’m just curious if I’d need a check valve to keep manifold water from going into engine. But yes the first one is done and everything seemed ok on sea trial.

It’ll be a while before I get it post a pic. The easy numbers to remember were non bypassed 30+ over 5k. Bypassed on one side was less then 20. This was tied to dock in neutral. So the second bypass should relieve enough pressure so it’s back to speed pressure and not rpm based.

These are the Ts I’m gonna go with. I bought Ts and nipples but the kit is too big to look clean so gonna swap to these. Also just a nipple threaded in place of the plug with some 1/2 inch heater hose from auto parts store. Clean set up.

1 Inch x 1 Inch x 1/2 Inch PEX Tee, Brass Construction