Mercruiser 165 inline 6 Fuel Filters

[corona2627]

I have a 1971 Glastron V-174 with a Mercruiser 165hp inline 6 serial # 3078952 that I am restoring. Owner before me has rigged up fuel line with filter from gas line to fuel pump. I would like everything as orginial as it was, but I cannot figure out where the fuel filters should be on this model. The fuel pump looks orginial, and no visible fuel filter, and the same with the Carb., no signs of inline filter there. Could you tell me where the filters should be located and what type of filter should be used. Also, if anyone has pictures of fuel line to fuel pump, would be most helpful.

Thank-you,

Dianne

 

[ziggy]

Re: Mercruiser 165 inline 6 Fuel Filters

in both my '72 and '75 with a carter fuel pump on them. the fuel filter is in the cap of the fuel pump. there is also a screen type filter at the inlet to the carb.

this is the carter fuel pump. under that bail, in the can, is the filter...

this is a pic of the filter screen at the inlet to the carb.

granted a filty dirty screen, but it cleans up..
that screen fits inside that big nut holding the metal fuel line to the carb.

that's assuming ya got the rochester 2gc carb. like i got. both my '72 and '75 had this carb. the pic is of the '75 carb. i'm running the '72 carb on my boat now. they are the same carbs..

edit..
btw, welcome to iboats...
+

if anyone has pictures of fuel line to fuel pump, would be most helpful.

sorry, no pics ready available for that. but it's pretty straight fwd. the fuel line runs from the fuel tank to the fuel pump w/o any thing in between them. just a straight run... fwiw, you can run a fuel/water separator in between the tank and the fuel pump and many folks do. in my case, i don't. just the straight connection between the two..

also, fwiw. that fuel pump in my pic is not a marine rated fuel pump (though i do believe it to be the oem fuel pump). i don't beleive the manufactures had a marine fuel pump in that era. a real good up grade would be to get a new fuel pump that is marine rated. easiest way to tell is the marine one has three connections, the auto version has only two. in and out. the marine is, in and out + an extra line going to the top of the carb so that if the diaphragm ruptures the fuel is directed to the carb and don't spill into the bilge like it does on the auto version..

 

[mkast]

Re: Mercruiser 165 inline 6 Fuel Filters

http://www.mercruiserparts.com/selectDocs.asp?doc_nbr=57569
Click on the fuel pump and carburetor link, item #2

 

[Fishermark]

Re: Mercruiser 165 inline 6 Fuel Filters

An easy, quick, and efficient thing to do for the fuel line is to simply buy a straight length of 3/8" steel fuel line and bend it to fit - using the proper tube bender tool. That's what I did with mine:

Here's the fuel pump on mine:

 

[Bondo]

Re: Mercruiser 165 inline 6 Fuel Filters

I would like everything as orginial as it was,

Ayuh,... I suggest adding a canister filter like Marks, original or Not....
And, it can be Anywhere between the tank, 'n the fuelpump,...
It don't have to be right beside it like Marks...

Those old fuelpump filters, 'n carb filters do little or Nothing to stop Water...
And with the new fuels,... Water is more, 'n more of a Problem....

 

[corona2627]

Re: Mercruiser 165 inline 6 Fuel Filters

Thank you for the great replies and welcome. I have been a fan of this site for over a year, and now that I have my project in hand, hope to get great advice with your expertise.

Wonderful pictures, and I do have the Rochester Carb, but apparently the previous owner took off the steel fuel line and filter, replaced with 1/4 inch rubber fuel line. I will purchase and install the 3/8 steel line, but I would like to know, since this previous owner didn't know what he was doing, what type of line to use from the gas line to the fuel pump. He has rigged a 1/4 inch rubber there as well. Also, I do have a Carter pump, but it is the type that is used on GM 305, 350, round solid type, with no visible filter, so apparently I have no filters at all now, but the guy did rig up a inline filter between the gas line hook up and the fuel pump.

I have another question, what is the function of a water shutter in the exhaust elbow assembly. I am replacing the exhaust elbow due to the inner tube being rusted out, and no water shutter was found, yet in the schematics of parts, a water shutter was present. Do I need one, and if so what is its purpose?

Thanks guys, you are great.

Dianne

 

[ziggy]

Re: Mercruiser 165 inline 6 Fuel Filters

what type of line to use from the gas line to the fuel pump. He has rigged a 1/4 inch rubber there as well.

i don't know if i was steered right or not. but i R&Red that hose this last summer. i went to my local mercruiser dealer and told him i wanted that hose. he came back with the same small dia. hose yer talking, non uscg approved. no mention of any thing special about the hose. that's what he sold me at the mercruiser dealer..
i havn't even read up on it in a while, but here's the low down by today standards. follow the fuel links. http://www.uscgboating.org/regulations/boat_builders_handbook_and_regulations.aspx
fwiw, out old boats likely don't meet today's standards. the standards have changed.

Also, I do have a Carter pump, but it is the type that is used on GM 305, 350, round solid type, with no visible filter, so apparently I have no filters at all now, but the guy did rig up a inline filter between the gas line hook up and the fuel pump.

to me, it seems like a good time to get the proper fuel pump/filter that Fishermark is showing ya. loose the inline filter. if ya want to do the fuel/water separator, then would be the time to do that too.

I have another question, what is the function of a water shutter in the exhaust elbow assembly. I am replacing the exhaust elbow due to the inner tube being rusted out, and no water shutter was found, yet in the schematics of parts, a water shutter was present. Do I need one, and if so what is its purpose?

the water shutter (flapper) flaps closed when water is rushing up the exhaust system backwards for a few possible reasons. backing. following seas, being beached and waves slamming into the drive. maybe more scenarios. i have mine, my last boat didn't so i put them back where they belonged. it's a part that's supposed to be there by design. when cooling water and exhaust are flowing out, the water shutter opens fully and lets the water and exhaust flow by.

 

[Fishermark]

Re: Mercruiser 165 inline 6 Fuel Filters

what type of line to use from the gas line to the fuel pump.

By Coast Guard regs, you do need a flexible line between the metal line and the pump. Instead of trying to find the original hose, I suggest adding the appropriate barbed fuel fitting to the end of the metal line coming from your tank, and then buying a length of rubber A1 marine fuel hose to run to your pump. That's exactly what I did with mine. And I made sure it was 3/8" line. Note the barbed inlet fitting on my pump.

Also, I do have a Carter pump, but it is the type that is used on GM 305, 350, round solid type, with no visible filter, so apparently I have no filters at all now, but the guy did rig up a inline filter between the gas line hook up and the fuel pump.

Yeah, you definitely want to get rid of the inline filter. If you decide to install a water separating filter - which is a good idea to do - then it would suffice as the only filter you really need. Regarding your existing fuel pump - I believe you can have the type you mention and it works fine. You might want to make sure it is a marine pump - and replace it if it isn't. Like Ziggy says, the older boats did not have a provision for an overflow tube in case the diaphragm ruptures, while the newer pumps do. I would suggest upgrading the pump to the newer style.

I have another question, what is the function of a water shutter in the exhaust elbow assembly. I am replacing the exhaust elbow due to the inner tube being rusted out, and no water shutter was found, yet in the schematics of parts, a water shutter was present. Do I need one, and if so what is its purpose?

I do not have one in mine - and haven't for years. I know many do not have them and have no issues at all. Whether to replace it is up to you - in theory it keeps the water from backing into the engine with a following sea or a sudden stop.

 

[corona2627]

Re: Mercruiser 165 inline 6 Fuel Filters

Thanks again for all the great information. Will certainly replace those fuel lines.

I do have another problem/question regarding the Water Shutter to the exhaust elbow. How do you put the darn thing on?? My new exhaust elbow came and was noticing that it did not come with the inside tube, so I ordered the tube. Now that I had all my parts was looking inside of the new exhaust elbow to see how the tube would go in and noticed that the new elbow has two built in ears that prevents the tube from going in, so then I try to figure out how the water shutter would be placed, and it seemed the the ears in the elbow would hold the support bracket that apparently hold the water shutter, but it all seems so awkward.

Can anyone explain...Do I not need the inner tube? How does the water shutter go on?

Thanks,

Dianne

 

[ziggy]

Re: Mercruiser 165 inline 6 Fuel Filters

i don't know about this tube yer talking about.

i believe this is my '75 exhaust pipe, could be the '72, but thinking '75, anyways. i'm looking down from the top into it.

the flapper is missing in the pic. the flapper is a oval too when spread out. it has a flat bar the separates the flapper in half. this bar fit's into the slots just above the tangs that stick out from the mounting point on both sides.
if i remember right. yer supposed to drill off the rivets on one side so ya can slide the bar in place, then re rivet the mount back onto the exhaust pipe...

understand i am a real do it by the book guy since i know nothing other than what the book tells me to do. (for the most part) but man, to drill them rivets off i'd have had to pull the exhaust pipe. do what ya want and don't do this. but i took some big pliers and bent the flat bar on my new flappers till it was short enough to slide into the mounting slots. then bent it back straight. silicone it in place and was done with it... don't do that. but it did work for me...

 

[Fishermark]

Re: Mercruiser 165 inline 6 Fuel Filters

don't do that. but it did work for me...

Ziggy - sounds like you're a lawyer!