Fuel Filter

rasbury

I have posted this before and either I was unable to understand the answers but still trying to resolve. I want to replace my inline fuel filter. I went to Marine Max which could not offer any assistance. I have the 350 MPI motor and know enough about filters to know that they are rated to pass a certain amount of fuel. I would think if you put one on there that does not supply enough fuel, you could lean out the motor which would not be good. I've looked at all sorts but just can't seem to identify what I need....any help? 

F1100

I use inline filters on my race car to supply a v8, actually 3 , one prefilter, and 2 post filters after the pump. If the Diameter of the fuel line is not big in enough in theory you could go lean at WOT. However stock fuel lines can supply more than enough fuel volume. If your filter is plugged I guess you could restrict flow at some point to lean the engine out.

Are you asking for what type of filter you need? Marine has some nice water separators as well.. I would go with one of those vs a straight automotive type inline filter.

It also depends on the sensitivity of your pump type. A old school mechanical pump you could probably get away with a fine mesh type filter. For a performance inline pump like a Aeromotive A1100 type, you need a prefilter and post filter minimum, as they are VERY sensitive to ingestion of junk.

Cableguy Greg

Can you post a picture of what you are trying to replace?

rasbury

Here is a picture of it...also, from the portion of the tank that is exposed, what am I looking for grounding of the tank?

Black_Diamond

That in-line filter is a Mercury filter. If you take it away from the firewall you will see the part number. 

rasbury

I will pull it and take it down...10 year old filter. What about the tank grounding? Also, that picture is taken looking down at it, mounted by the tank. I also have a filter for the Genny...

Black_Diamond

That 5e generator has a fuel filter at the fuel pump inlet plus the inline one (at least my 342 had both). I got rid of the one at the fuel pump. Pita to change. I have a raycor inline filter. 

Robs_232

Ras,

Hear is link to Mercruiser filter part number 27. I have used a Sierra brand also.

http://www.mercruiserparts.com/Show_Pictures3.asp?dnbr=884717&ivar=images/COMMON/1354.png&inbr=8093&bnbr=80&bdesc=Fuel+Filter+and+Boost+Pump(BRAVO)

Rob

rasbury

Rob- that is the fuel/water separator and I have that one and getting ready to change...this is an inline filter before the fuel water seperator...but thanks for the info!

rasbury

What about the fuel tank grounding I hear about? I see nothing as far as any wires going to the fuel tank.....is it done in the mounting of it somewhere and I should not be concerned?

aero3113

It doesn't look like its grounded through the mounting bracket,it's insulated with black rubber.

Cableguy Greg

Ras... If you scroll down on the picture, there is an inline filter, part number 27. It is what you are looking for. Here it is on Amazon.

http://www.amazon.com/Fuel-Filter-Mercury-Mercruiser-35-864572/dp/B001H3FS9W

rasbury

ah, thanks Aero so I don't have to worry about that....I was reading some other posts that if the tank is not grounded it promotes corrosion....and thanks to you Greg, I will get that ordered. After 10 years, there has to be some crap in that filter for sure and should have changed it when I bought the boat....

Black_Diamond

I change my in-line filter every 2 years. 

rasbury

then I'm only 5 changes behind.....guess it might run better!

Michael T

All the fuel filters on my boat will be changed every two years at the longest time interval. If I put more hours per season than usual I will modify that change interval. I waited two years with this boat. The generator fuel filter was pretty good (low hours) but it definitely was time for the cool fuel module filters. I posted pictures in the Fall and they had done their job and were dirty.

rasbury

I don't think I have the cool fuel? I have 350 MPI 2005...unless I missed something looking it over. And if it is there, another filter I did not know I needed to replace. I need to change the genny one to- since that is Kohler, will the boat shops have those as well? I need to look at my manual and check out the cool fuel deal and see if I have that....

Cableguy Greg

The cool fuel filter is on the front of the engine by the sea water pump. It takes a cartridge type filter rather than the screw on type.

rasbury

so if I have a cool fuel filter (no clue what cool fuel is!), do I need a separate inline filter at all then? Guess I need to figure out if I have it either way....

Michael T

The cool fuel module is a black "box" under the starboard front of the engine. It has two fuel filters in it. The initial filter is a small round one to trap larger particles and the second one is a pleated filter for the smaller particles. Both are housed in the cool fuel module that uses raw water to cool the fuel to prevent vapour lock. I have not seen additional filters on engines with the cool fuel module and would not think any would be needed.

rasbury

wow, I put a comment in here and it did not stick!

rasbury

I looked at the manual again, I have a fuel pump that looks like what it shows but I do not have the black box with water going anywhere near the fuel lines- I will look again tonight before I take it back to storage. I also have a closed loop system, don't know if that makes a difference and perhaps that system cools the fuel in another way. I will need to look into this further and will report back!

Michael T

It sounds to me like you don't have the cool fuel module but do have a proper in-line fuel filter. I have had these as well as water separating fuel filters on many boats. I changed them every season - and that was with 91 (non-ethanol) gas!

rasbury

I looked again and I just don't see anything like that- tank to the fuel water separator to the fuel pump. I can't really feel the other side of the pump but the manual shows that if I had cool fuel, the fuel would go vertical into the cooling tube where the raw water would cool it- I just don't see that I have it. I have a closed loop cooling so I would think possible it cools the fuel somewhere else in the system and will have to look again next service which will be soon- I do my oil and stuff in the winter as it's cooler out to work on it vs. spring when typically by Feb/March is 90 degress....

rasbury

it does not, however, make sense that everyone else seems to have and mine does not.

seguir

I'm averaging 50  hours run time per season.....I change my fuel filter (cool fuel module) after I run the first tank of fuel out at the start of each season.  Am I changing my filter to often.  The average cost is about $90 Canadian for both filters.

Michael T

@Seguir, In my opinion and based on what I aw this year I may switch my cool fuel filters after one year. The tech suggested two years but based on what I saw in both filters on both cool fuel modules I think I'll change them every year. It's cheap insurance compared to fuel rail/injector problems.....and I buy 91 octane marine gas (no ethanol) from a high volume marine gas dock. Plus these guys have special filters to trap the crud that gets stirred-up when the tanks are filled.....I'm sure everyone on here knows if you arrive at a gas station and a big tanker is filling the stations tanks it's recommended to drive away as there will be a lot of crud stirred-up unless the stations have special filters to combat that - and I'm told few do.

rasbury

@Robs_232 @Cableguy Greg back on this- looking at what Rob sent, that is exactly what mu fuel set up looks like- so that means I don't have the cool fuel, correct? I want to replace all the fuel system filters......

Robs_232

Ras,

Yes you do probably have a fuel cooler, just not like the newer version with filters. I am attaching the link to the 350 MAG like mine. Scroll down to Fuel pump and fuel cooler. Open that and you will see what the older version is like. If you need to replace the fuel pump on this version you will see that is no longer available and there is a link to a service bulletin that shows the fuel cooler kit available.

http://www.mercruiserparts.com/selectDocs.asp?doc_nbr=884717

Rob

rasbury

@Robs_232 , so it looks like this is on the port side of the motor? I really need to get the boat home and look at it...on the starboard side I have a fuel water separator filter, a fuel pump......I thought it just went to the fuel rail from there. I have a manual that someone on here provided which shows what the cool fuel looks like. With the range of serial numbers the manual covered, mine is outside that manual, I guess an earlier motor. I thought with my serial number I just received from Rinker (thanks again to Terri!), I went on the site you provided thinking it would show me my exact motor but not sure I'm understanding the serial number ranges.......my serial number is OW038097...so when I look up on that site, my motor will fall between the ranges of OM600000 and OW059999 corect? Which looks to be the same link you sent as well....and I'm thinking that is on the port side not starboard.  I don't see any filters on this set up, only the inline filter talked about above which I know I need to replace along with my fuel water separator filter. I'd bet the inline filter has never been replaced. I need to do the same for my genny which I have not replaced any of those yet either- Looks like I have a spin on filter type on the fire wall for the genny, not sure if I have any other filters or not. I really thought I'd be using the genny much more than I do- when I get the rest of the enclosure done and get the admiral to try going on the hook I'm sure I will use it more..thanks for all the info guys!

aero3113

This thread has me wondering if I'm missing any filters or screens? I have a 2001 carbed 5.7. Is there a screen in the electric fuel pump? Also is there one up by the fuel inlet line at the carb like some cars have? The only filter I know of is the spin-on one.