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Fuel Line Configuration - 175 XR2

kaylix

Member
Messages
19
Reaction score
3
Points
12
Boat Make
Sugar Sand
Year
1997
Boat Model
Tango Xtreme
Boat Length
17
I removed and cleaned the fuel pump and bought a new diaphram kit. The new kit, from Mercury Marine with manual dated 1999.
Also, I am changing fuel lines and installing a new electric fuel pump (the old one was disconnected from the engine).
Here are my questions:
1. The Diaphram kit did not come with Rubber Check Valves as indicated in the original Maintenance manual from 1996 (#4 in the diagram)
Mercury 175 XR2 Fuel Pump Assembly 1996.jpg


Instead it just came with the Plastic portion of the check valve (#G in the diaphram kit from 1999)
Mercury 175 XR2 Fuel Pump Diaphram Kit 1999.jpg
Mercury 175 XR2 Fuel Pump and Diaphram Assembly 1999.jpg

All the other kit components were included. The reassembly diagram also leaves out the Rubber Valve. Do I assume the manufacturer is suggesting the Rubber Valve is no longer necessary I can can leave it out of the rebuild?

2. The fuel lines were routed differently to bypass the Electric Fuel Pump. So I'm a Little confused how the lines are supposed to connect. What connects to the Yellow Fuel Filter (I assume a line from the tank but my line from the tank goes into a device that looks like a fuel filter
Fuel Route.jpg
 

kaylix

Member
Messages
19
Reaction score
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Points
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Boat Make
Sugar Sand
Year
1997
Boat Model
Tango Xtreme
Boat Length
17
Is the yellow Inlet on the electric pump the primary fuel input?
 

kaylix

Member
Messages
19
Reaction score
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Points
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Boat Make
Sugar Sand
Year
1997
Boat Model
Tango Xtreme
Boat Length
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OK, I see that the yellow is the primary Fuel Inlet Fitting according to the service manual.
Since I removed the Oil Tank and Pump and Installed a Plug. What do I do with the oil inlet tube going to the T where the Fuel enters? Just Plug it? Or replace the T inlet fitting? Do you know what size it is?
 
Last edited:

Blkrvrbart

Well-Known Member
Messages
104
Reaction score
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Boat Make
Sugar Sand
Year
2001
Boat Model
Tango
Boat Length
16
When I deleted my oil injection system, I just removed the big tank, lines to it, small tank on the motor, line from small tank to oil pump, and capped the oil line on the pump as shown. Removed the linkage rod from the throttle to the oil pump. I also removed the pressure check valve from the block and installed a stainless steel pipe plug. I kept the fuel lines and wiring as is. Hope this helps. 2D1C3C11-F86F-4BA7-BEDC-8B4FC9938AFC.jpeg5258A39B-AC36-4585-9247-947C94F05F7B.jpeg784E4AB6-BF97-4A59-B913-5BCF0FCDB56D.jpegBDF88678-2907-4EA7-86B8-A2A25600AB8B.jpeg
 

kaylix

Member
Messages
19
Reaction score
3
Points
12
Boat Make
Sugar Sand
Year
1997
Boat Model
Tango Xtreme
Boat Length
17
Very helpful!
You have some very clean carbs :)
 
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