80 SC Hot start problem

lochrie2 · lochrie2's Garage

Been having a Hot start problem. I checked the FA for malfunction by taking the fuel return line off the bottom and plugging the return line, pressurized the system and no evidence of fuel leaking through FA so I hooked up my gauge to the fuel supply line before the accumulator and ran the FP to 3 bars shut the FP off and the pressure dropped to zero immediately. does this confirm the check valve is bad?

Thanks, Chad

lochrie2 · lochrie2's Garage

I did hook up the gauge with the valve closed so I could isolate the check valve test

boyt911sc · boyt911sc's Garage

Quote:

Originally Posted by lochrie2

I did hook up the gauge with the valve closed so I could isolate the check valve test

That was a good way to test and isolate the FP check valve. This is also a good time to inspect your fuel lines.

Tony

lochrie2 · lochrie2's Garage

Thanks Tony, i will definitely inspect those while im under there. Glad it was the cheaper part!

lochrie2 · lochrie2's Garage

Thanks for the help this is my first 911 so its been fun learning all about it! all those years back in the day working on CIS Volkswagens has really paid off

runs like a top other than the hot start issue

targa80 · targa80's Garage

It has been a long time ago that I had the hot start issue and the fault was with the internal check valve in the fuel pump. Ordered the external check valve to fix the problem. I do remember having an issue with a missing part required to connect the new check valve to the banjo fitting. As a suggestion take a close look at what is needed to add an external check valve to the fuel pump. I was not happy when the new valve came but I needed one more part to hook it up to the banjo fitting.

lochrie2 · lochrie2's Garage

Quote:

Originally Posted by targa80

It has been a long time ago that I had the hot start issue and the fault was with the internal check valve in the fuel pump. Ordered the external check valve to fix the problem. I do remember having an issue with a missing part required to connect the new check valve to the banjo fitting. As a suggestion take a close look at what is needed to add an external check valve to the fuel pump. I was not happy when the new valve came but I needed one more part to hook it up to the banjo fitting.

On the 80 the check valve is already external