Oil pressure switch?

I need to know do I need to mount both units in order to get the fuel pump to work properly
 
I know where the sending unit is,it tell me the PSI on the console,but does it also works with the fuel pump?or do I need a oil pressure switch to make it work.
 
I know where the sending unit is,it tell me the PSI on the console,but does it also works with the fuel pump?or do I need a oil pressure switch to make it work.
Some boats have both, some don't. A sending unit sends a variable resistance signal to the gauge and the other one is a switch that is sometimes used to interrupt fuel pump power if there is loss of oil pressure.
What is the problem that your are having?
 
I have a 1988 34 ft Sea Ray, it came with just the sending unit, the previous owner change over from a mechanical fuel pump to electric fuel pump,hello and my dilemma would I need to install both? And if so can I install them on the same side as the oil sending unit that goes to the gauge of the engine?
 
No. You cannot use your sending unit for both. You have to install a normally open pressure switch so it can shut down the full pump if the engine quits (loss of oil pressure). It is also important that the correct fuel pump is installed for a carbureted engine and/or pressure reducing valve to be added. Too high of pressure can lead to flooding. Sounds like the previous owner did a quick patch/fix. Post some picks of what you are dealing with.
 
Thank you for replying to my post my intent is to wire from the ignition switch to the oil pressure switch and then back to the fuel pump as required by the coast guard.yeah I know I'll need some new fuel pumps that are regulated at six to seven pounds of pressure to each of the carburetors which are Rochester 4-barrel carburetor on a Ford and a 454 engines
 
Now my problem is is that I have one port on each engine for either oil pressure switch or either oil gauge, is there such a such a oil pressure or an oath which are combined together or do I need to make a manifold for oil pressure is on one side and the sending unit which is on the other side
 
Really it would be best to put them in separate oil gallies in the block. That way your readings will be more correct. You can also get an adapter ring that goes on the filter mount. It just sandwiches between the filter block and the filter. It will have ports to mount to. GlowShift | Oil Filter Sandwich Adapters (glowshiftdirect.com)

Another thing to remember with electric fuel pumps is the need for a return line to the tank. If there is ever a fault in the pump, you can very easily flood a carb bad. Been stuck 40 miles from pavement in an old Jeep I had because of this. And walking 40 miles out of the woods is better than filling a bilge with fuel.

If it were me, I would put the mechanical pump back on. And when you order the new pump, get a rebuild kit to throw in the parts box that stays on the boat. I've never had one go bad and over pressurize like I have an electrical pump do, more than once.
 
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thank you for the reply and yes that is a great idea but at the moment the mechanical pumps are really hard to get to on the big blocand yeah the fuel pump has a return valve going back to the tank yeah I checked that out myself to make sure.
 
My wife and I live in Zuni Virginia we've been here for quite a while and we have just now purchased our first boat together which is a 1988 34 ft Sea Ray
 

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