The Ford Barn

37Flat · 11-18-2018, 11:58 AM

I had my machinist install Red's Headers Full flow filter system. The 2 hoses hook up to the block where the pressure sending unit was. Is using the plug on the side, just below the hose fittings the option for the sending unit? Will mounting it sideways effect it's ability function? So close to start it for the first time!

RalphM · 11-18-2018, 12:06 PM

If it’s just a plug, it should be ok, if it’s like the special plug used on the Canadian oil conversions, then taking it out would change oil flow. Best to ask machinist what style /type he used.

51 MERC-CT · 11-18-2018, 04:03 PM

See post #5 in this thread--

https://www.fordbarn.com/forum/showt...40#post1694840

deuce_roadster · 11-19-2018, 12:56 AM

MAKE SURE you know the OUT fitting and the IN fittings in the block. On all my flatheads with full flow filters, the oil from the pump comes out the boss where the sender originally was and goes back in the fitting closer to the centerline of the block on the bellhousing.

I know of 1 newly rebuilt engine where the lines to the filter were hooked up backwards and the engine ran for about 20 minutes before it seized. The oil pressure gauge showed pressure alright but no oil was getting back into the engine.

37Flat · 11-19-2018, 01:45 PM

As the boss is where the sender was originally, then in and out should be like yours deuce_roadster, correct? The plug is a standard 3/8 NPT, so to put the sender back will take an adapter, if that is where it should go. The thread was very helpful. I sent an email to Red's for some input. Will let you know what I find out. Thanks for all the good info.

deuce_roadster · 11-20-2018, 01:19 AM

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I believe your setup is the same as all mine are. You can put the oil pressure sender where the plug is, The remote filter should have clearly marked "in" and "out" ports. If you visualize the path of the oil you will be OK. Out of block, IN to filter, OUT of filter, IN to block.

Bored&Stroked · 11-20-2018, 07:29 AM

There should be no problem putting the pressure sending unit on the horizontal plug location - it could be a 1/4" NPT or 3/8" NPT - can't quite tell. The out port should be the one closest to the pipe plug - with a passage straight down into the pump oil galley.

rotorwrench · 11-20-2018, 07:17 PM

Pull that horizontal plug out and you can put a tool of some sort in that port and feel for the vertical port next to it. If it's open, your good to go. The full flow mod generally calls for a plug in the passage beyond that vertical one so that the oil doesn't bypass the filter. The instructions for the kit usually show the internal porting for this mod.

flatjack9 · 11-20-2018, 08:00 PM

I would put a tee in the port closest to the center of the block and put your sender in there. I prefer reading the pressure after the filter.

11-18-2018, 12:06 PM	#2
RalphM Senior Member Join Date: Nov 2015 Location: North Pole, Alaska Posts: 2,651	Re: Pressure Sending Unit w/Full Flow If it’s just a plug, it should be ok, if it’s like the special plug used on the Canadian oil conversions, then taking it out would change oil flow. Best to ask machinist what style /type he used.

11-18-2018, 04:03 PM	#3
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: Pressure Sending Unit w/Full Flow See post #5 in this thread-- https://www.fordbarn.com/forum/showt...40#post1694840 __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES

11-19-2018, 12:56 AM	#4
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,800	Re: Pressure Sending Unit w/Full Flow MAKE SURE you know the OUT fitting and the IN fittings in the block. On all my flatheads with full flow filters, the oil from the pump comes out the boss where the sender originally was and goes back in the fitting closer to the centerline of the block on the bellhousing. I know of 1 newly rebuilt engine where the lines to the filter were hooked up backwards and the engine ran for about 20 minutes before it seized. The oil pressure gauge showed pressure alright but no oil was getting back into the engine.

11-20-2018, 01:19 AM	#6
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,800	Re: Pressure Sending Unit w/Full Flow Sponsored Links (Register now to hide all advertisements) I believe your setup is the same as all mine are. You can put the oil pressure sender where the plug is, The remote filter should have clearly marked "in" and "out" ports. If you visualize the path of the oil you will be OK. Out of block, IN to filter, OUT of filter, IN to block.

11-20-2018, 07:29 AM	#7
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,068	Re: Pressure Sending Unit w/Full Flow There should be no problem putting the pressure sending unit on the horizontal plug location - it could be a 1/4" NPT or 3/8" NPT - can't quite tell. The out port should be the one closest to the pipe plug - with a passage straight down into the pump oil galley.

11-19-2018, 01:45 PM	#5
37Flat Senior Member Join Date: Jan 2013 Location: New Braunfels, TX Posts: 125	Re: Pressure Sending Unit w/Full Flow As the boss is where the sender was originally, then in and out should be like yours deuce_roadster, correct? The plug is a standard 3/8 NPT, so to put the sender back will take an adapter, if that is where it should go. The thread was very helpful. I sent an email to Red's for some input. Will let you know what I find out. Thanks for all the good info. __________________ Chris KNKStudio221.com

11-20-2018, 07:17 PM	#8
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Pressure Sending Unit w/Full Flow Pull that horizontal plug out and you can put a tool of some sort in that port and feel for the vertical port next to it. If it's open, your good to go. The full flow mod generally calls for a plug in the passage beyond that vertical one so that the oil doesn't bypass the filter. The instructions for the kit usually show the internal porting for this mod.

11-20-2018, 08:00 PM	#9
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: Pressure Sending Unit w/Full Flow I would put a tee in the port closest to the center of the block and put your sender in there. I prefer reading the pressure after the filter.