electric fuel pump and water separating fuel filter

[docpaulo]

Hi

I have a mercruiser 5.0 carb v8 and it has an electric pump.

I will be installing a fuel flow sensor and can only put it before the installed fuel filter...

so is it going to be a problem to have a 2nd fuel separating filter prior to the original fuel filter (running 2 filters instead) so that I can have the sensor installe d after a filter.

I know the issue has to do with fuel pump pressure...

any experiences???

thanks

 

[Haut Medoc]

Re: electric fuel pump and water separating fuel filter

It should have no effect.....
Why bother with that sensor anyway?......​

 

[docpaulo]

Re: electric fuel pump and water separating fuel filter

ok thanks...

as to using it... just another gadget I suppose... but hopefully it helps me save gas in the long run...

anybody actually have a similar setup running?

 

[Haut Medoc]

Re: electric fuel pump and water separating fuel filter

Just curious....
How do you expect it to save fuel?......
& no, I have not seen one in action.....
I suppose it would be an alarm for excessive fuel consumption, esp for twin engines......​

 

[imported_TheMan]

Re: electric fuel pump and water separating fuel filter

optimizing his cruising speed for mpg maybe? seems more like a one time thing to me... although I like gadgets too.

 

[erikgreen]

Re: electric fuel pump and water separating fuel filter

I've been thinking of getting one for that... optimizing fuel use. Helpful to know that if I back off a couple hundred RPM I save a gallon an hour when going into a headwind.

Also good for after a repower when you don't know what mileage to expect.

And they're cheap now, the lowrance ones are less than $200.

Erik

 

[bruceb58]

Re: electric fuel pump and water separating fuel filter

I have a fuel flow sensor. I can adjust my trim and RPM for max MPG.

 

[docpaulo]

Re: electric fuel pump and water separating fuel filter

I have a fuel flow sensor. I can adjust my trim and RPM for max MPG.

that's exactly the reasoning for me getting it... changing load conditions require changing rpm, trim, etc...

i also have a 3 and 4 blade prop and want to compare efficiency of both depending on load...

 

[DrD]

Re: electric fuel pump and water separating fuel filter

I recently installed a Floscan 7000. I had a few posts with initial questions and I know I probably pissed off a few people by asking them ... but here is the payback:

The Floscan installation suggests adding an Ezflo 238 micron pre-filter before the sensor. I used an angle bracket and installed the prefilter and sensor on that, using 3/8" x 1/4 npt barb fittings on each end. Then I mounted it in a secure position above the bilge waterline, but upstream and below the engine mounted fuel filter. You can read the Floscan installation manual here (to get some useful tips):

http://www.floscan.com/html/blue/gas_installation.php


The installation works just fine, and since the Floscan has a built in tach, hour meter, and gph / total fuel used, I have a nice check on engine performance as well as being able to keep the boat trimmed for best fuel econonmy. The instrument display fit in the original tach hole in the dash, so it was not necessary to make any new holes in the helm for that!

When I need to clean or change the filter element, I am going to add a union between the filter assy and the sensor to make the change process easier. I would have done that already, but couldn't lay my hands on one by the time I needed to get this job done.

-Dale-

 

[tommays]

Re: electric fuel pump and water separating fuel filter

I find the fuel flow to be VERY usefull even on MY 3.0


Small amounts of trim and speed changes can make a 50 % difference in MPG from 2.5 to 5 MPG


As i offen take trips of 90 miles with a 36 gallon tank you can see were the 2.5 MPG would cause a problem if you were not aware