how much filter, causes fuel flow problems??

[bob johnson]

I have just mounted my 1997 Johnson Fast Strike 175 onto my starcraft. I rigged up two fuel tanks under the floor and have a T valve to pull gas from one, OR the other. I ran the outlet line to my fuel -water separator. then I run the line to the BULB and then into the motor.

now I have a similar set up on my V4 and a few years back I think someone said I might have added too much restriction when I added an IN LINE fuel filter as well.

since both my new boats gas tanks were hand me downs, and since they sat around for a year or so... I suspect( even though I cleaned them) that I might have some debris...sooo I want to at least add a temporary paper in line filter.....but will this set up restrict the fuel demands of the V6 175.....

also is there any type of debris filtering going on in the tempo separator????

thanks

BOB

 

[metriccrescentwrench]

A good filter/separator (such as a Racor) is all you need. They've got plenty of surface area so that flow isn't restricted, I've had a Racor on my 175 since I put the engine on several years ago, just change the element every year and you're good to go. Also, if there's any large debris they'll show up in the bowl and you can drain them out.

 

[jakedaawg]

Many of the spin on fuel water separators are fine. Sierra, available here, makes 10 micron spin on filter models. That's finer than the typical inline filter.

 

[bob johnson]

ill check what brand cartridge I have


BUT............ the question really is....does adding an inline filter put a drag on the fuel supply ( with the other components in place as stated)???? and is it too much for the needs of a v6




bob

 

[oldboat1]

Can't supply hands-on experience, but west marine has an interesting article, seems informative: http://www.westmarine.com/WestAdvisor/Multi-Stage-Fuel-Filtration. If you were to pick up a filter housing with the primer pump, you could get rid of the bulb assembly, at least, as a source of restriction. But the bottom line re. dual filtration seems to be adding an inline filter wouldn't make a significant difference in operation. (If naughty words in the hyperlink edit out, google multi stage fuel filtration, or similar.)

 

[bob johnson]

Can't supply hands-on experience, but west marine has an interesting article, seems informative: http://www.***************/WestAdvisor/Multi-Stage-Fuel-Filtration. If you were to pick up a filter housing with the primer pump, you could get rid of the bulb assembly, at least, as a source of restriction. But the bottom line re. dual filtration seems to be adding an inline filter wouldn't make a significant difference in operation. (If naughty words in the hyperlink edit out, google multi stage fuel filtration, or similar.)

link wont work

bob

 

[oldboat1]

try the google search I suggested. article is available, in addition to others I'm sure.

The west marine article has some installation advice, placement, etc. that is generally useful, but would indicate for your purposes that an additional filter would not be a problem. At the site, it would be West Advisor slash Multi-Stage-Fuel-Filtration.

 

[jakedaawg]

link wont work

bob

you would probably need to change the "*"'s to the site of some prominent business.

But, regardless of what the noobs at west marine have to say, put your filters on if thats what you want to do. Place them upstream of the vacuum switch that sets the alarm, if the alarm goes off remove filters till it doesn't.

 

[oldboat1]

Gents -- see the parenthetical note in the post. It's a good article, worth a little creativity.

 

[dingbat]

The in-line filter was the first to go when I put a Racor on my Ocean Pro 200. No need to tack chicken wire on top of the fly screen to keep the bugs from coming in.

Same dual tank configuration. I had to remove the anti-siphon valve to shut off the alarm when the tanks got low. That's how close the pressure drop was to the alarm set point.

In theory, your 175 HP should draw less flow than my 200 HP giving you a bit more leeway.

 

[oldboat1]

there you go, bob. Hands-on. The mounts for the spin on filters also sometimes have a primer pump built in -- could take out the primer bulb, if desired.

 

[Chris1956]

Every filter adds restriction to fuel flow, w/o exception. The spin-on water separators add much less restriction than your typical inline fuel filter, because, the water separators have much more filter surface. In addition, the typical water separator filter will filter as well or better than your typical inline fuel filter. That removes any benefit that the in-line filter could have.

I recommend the "float test" for the inline filter.