The Ford Barn

GAR64 · 12-27-2021, 02:44 PM

Getting very significant gas in the oil of my 47 flathead. Looking for way to diagnose the issue. I have electric fuel pump for assist on starting. Heard that perhaps bad diaphragm in stock pump may be the issue. Or perhaps the carb? Any ideas how to isolate the issue ??

TJ · 12-27-2021, 02:59 PM

When is the last time you changed the carb or pump? If it has been a long time or maybe you have never done it, I would do both. My first suspicion is the power valve in the carb.

GAR64 · 12-27-2021, 03:03 PM

I have just put on a another carb. I was hoping to verify what caused it instead of only checking oil level frequently.

marko39 · 12-27-2021, 03:13 PM

Send your fuel pump out for a rebuild. ( Charley ny)

Ggmac · 12-27-2021, 07:21 PM

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If you’re bypassing the original fuel pump there’s only one other piece , the carburetor. I would suspect a powervalve or heavy float ( incorrect float level )
I would change the oil asap !

12-27-2021, 02:44 PM	#1
GAR64 Senior Member Join Date: Aug 2013 Location: Upstate NY Posts: 208	47 Flathead gas in oil Getting very significant gas in the oil of my 47 flathead. Looking for way to diagnose the issue. I have electric fuel pump for assist on starting. Heard that perhaps bad diaphragm in stock pump may be the issue. Or perhaps the carb? Any ideas how to isolate the issue ??

12-27-2021, 02:59 PM	#2
TJ Senior Member Join Date: May 2010 Location: Napa,California Posts: 6,029	Re: 47 Flathead gas in oil When is the last time you changed the carb or pump? If it has been a long time or maybe you have never done it, I would do both. My first suspicion is the power valve in the carb.

12-27-2021, 03:03 PM	#3
GAR64 Senior Member Join Date: Aug 2013 Location: Upstate NY Posts: 208	Re: 47 Flathead gas in oil I have just put on a another carb. I was hoping to verify what caused it instead of only checking oil level frequently.

12-27-2021, 03:13 PM	#4
marko39 Senior Member Join Date: Oct 2016 Location: harpursville ny Posts: 1,040	Re: 47 Flathead gas in oil Send your fuel pump out for a rebuild. ( Charley ny)

12-27-2021, 07:21 PM	#5
Ggmac Senior Member Join Date: Jul 2016 Location: Lake worth Florida Posts: 1,086	Re: 47 Flathead gas in oil Sponsored Links (Register now to hide all advertisements) If you’re bypassing the original fuel pump there’s only one other piece , the carburetor. I would suspect a powervalve or heavy float ( incorrect float level ) I would change the oil asap !