Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: kevo0000 on May 25, 2020, 06:22:23 am
Title: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 06:22:23 am
Hya all, just changing fuel filters, I have the correct ones, just to be absolute sure on this, I think I'm correct but would like some confirmation, the primary fuel filter attaches to the engine, next to my two oil filters, and the secondary filter is attached right at the back on chassis just below where either start reservoir is situated, am I correct please, thanks kev
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 06:36:12 am
Hya all, just changing fuel filters, I have the correct ones, just to be absolute sure on this, I think I'm correct but would like some confirmation, the primary fuel filter attaches to the engine, next to my two oil filters, and the secondary filter is attached right at the back on chassis just below where either start reservoir is situated, am I correct please, thanks kev
Also, in the oshkosh parts catalogue, is showing that the one attached to the chassis, which appears to be the first in line from the tank is of cartridge type filter and yet the one I have taken off is a spin on filter, I can vaguely remember seeing secondary filter written on the side of it, but the writing is now worn off, so am not gonna replace them both until I hear some input from anyone thanks kev
Title: Re: Primary and secondary fuel filters,
Post by: ohsonew on May 25, 2020, 07:44:43 am
I can't say for certain on a GV, but on my 320 the primary was located by the start battery, passenger side behind the rear wheel and the secondary was located on the passenger side right on the engine block below the ECM. Again, I'm uncertain for your model, but I'm sure some will chime in. Also' check the micron ratings. The primary rating is larger than the secondary.
I've changed my primary from it's orignal Winn system. On it, there was a 30 micron (?) prescreen located on the filter assembly prior to going into the spin on canister primary filter.
Larry
Title: Re: Primary and secondary fuel filters,
Post by: FourTravelers on May 25, 2020, 07:52:45 am
Primary........... larger and first in line from the fuel tank, mounted on the chassis below the bed on ours. Canister type.
Secondary ........... mounted on the engine near the injector pump on ours. ' Need to move this post from classifieds to the "Discussions" section......
Title: Re: Primary and secondary fuel filters,
Post by: Jack Lewis on May 25, 2020, 08:40:59 am
Literature I found shows both being spin on type. I found this information on beamalarm and the filter links on line.
Luber-finer, Built to do More (http://productguide.luber-finer.com/Home/PartDetail?partNo=LFP936F)
Title: Re: Primary and secondary fuel filters,
Post by: John44 on May 25, 2020, 09:28:35 am
Sent him a message telling him to get the same part number filters that are on the unit and use them, unless someone has his same engine and filter setup our info is useless,if a manual says it takes a cartridge and he has a spin on we know the cartridge will not work.If you can post a picture of your filter setup.
Title: Re: Primary and secondary fuel filters,
Post by: FourTravelers on May 25, 2020, 09:43:19 am
Also a PO could have changed the filter setup from what was OEM.............
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 11:19:02 am
Primary........... larger and first in line from the fuel tank, mounted on the chassis below the bed on ours. Canister type.
Secondary ........... mounted on the engine near the injector pump on ours. ' Need to move this post from classifieds to the "Discussions" section......
Well I've ordered two filters I've cross referenced them from the owners manual and managed to come up with Baldwin filters both have different part no, s but both are exactly the same size, I found that detroit 8.2 originally used donaldson filters secondary being p550928 and cross ref to Baldwin BF593 and primary fuel filter being donaldson P550936 Cross ref to Baldwin BF592, if memory serves me the original filter did have secondary written on it but that was the one that was attached to chassis on drivers side rear and seems to be the first filter from the fuel tank, so to me somebody has replaced them in the past the wrong way round, what I'm trying to work out is the meaning of primary to me it means the main filter which I would have thought meant the one that bolts on the engine next to oil filters, but then if I read it the other way primary could mean 1st in line, which would make the one direct from fuel tank the primary, its how it is read and understood,, I've checked both manuals detroit 8.2ltr and also oshkosh manual, have found the one on the chassis, but can't seem to find the one in 8.2 manual with part no., I'm not gonna do anything until I'm absolutely sure, as for the filters being smaller, i have noticed in the past on various filters from different vehicles I've had that I take off a big filter, go and get a new one and they supply me with a smaller, and I've fitted them and everything works fine, the thing is if the filters were connected the wrong way round by someone in the past, how would that explain why the vehicle ran OK no problems,? Kev
Title: Re: Primary and secondary fuel filters,
Post by: oldguy on May 25, 2020, 11:23:23 am
Your primary filter will be the one that is the first one from your tank most likely the one buy the ether start.
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 11:51:21 am
Your primary filter will be the one that is the first one from your tank most likely the one buy the ether start.
OK thanks, yes that is the one by the ether start, so whoever had this before me could have got them wrong way round, but the ones that I have got are both same size, two small spin ons, I know there is a big filter which I have replaced which is for the transmission, at the moment, I've just got the engine running not connected to tank, because I've got diesel in main tank that has been there for 9 years plus without being used so gonna have to drain the tank and top up with new, so just got a 25 ltr can in the recess under bunk with fuel and return lines going into that for now until I get round to sorting out the main tank, but that will be one of the last jobs I do before it's ready to go, thanks a lot kev
Title: Re: Primary and secondary fuel filters,
Post by: Protech Racing on May 25, 2020, 11:59:21 am
Follow the lines from the injector pump back to the closest filter. This filter is the secondary. Run the part number of the installed filter. It should show as 1-5 micron size. If the micron rating is over 5, you probably have the wrong filter. Follow the lines from this filter to the next further from the engine. This should be the Primary. The part number should show a micron rating around 10 -12.
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 12:46:21 pm
Follow the lines from the injector pump back to the closest filter. This filter is the secondary. Run the part number of the installed filter. It should show as 1-5 micron size. If the micron rating is over 5, you probably have the wrong filter. Follow the lines from this filter to the next further from the engine. This should be the Primary. The part number should show a micron rating around 10 -12.
Perfect, thanks for that mate, il have a look now on sides of filters, mutch appreciated kev
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 12:50:24 pm
Perfect, thanks for that mate, il have a look now on sides of filters, mutch appreciated kev
Just had a look on these Baldwin filters, but nothing written about microns anywhere on it, is there a way, I can find these part nos and get the micron nos for these filters online anywhere please kev
Title: Re: Primary and secondary fuel filters,
Post by: craneman on May 25, 2020, 12:57:05 pm
The microns aren't written on the filter. You have to use the part number and do a search for the specs.
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 01:02:36 pm
I've tried looking for these Baldwin specs, no success, I've emailed baldwin to their technical department, hopefully they will get back to me, tell me which is worst if the microns are to high or too low thanks
Title: Re: Primary and secondary fuel filters,
Post by: oldguy on May 25, 2020, 02:11:08 pm
If you have a lot of fuel in your tank it might be a lot cheaper to have you old fuel polished.
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 03:20:42 pm
If you have a lot of fuel in your tank it might be a lot cheaper to have you old fuel polished.
I haven't got mutch fuel, guage is reading emty, but polished I'm confused on that one mate, is that joke?, I've never heard of polishing diesel ha ha
Title: Re: Primary and secondary fuel filters,
Post by: Rudy on May 25, 2020, 03:33:47 pm
Polishing diesel fuel is a very good thing especially if one suspects his fuel is contaminated with water or debris. Keith Risch at MOT has a portable fuel polisher and most areas with boat marinas have fuel polisher business nearby.
Title: Re: Primary and secondary fuel filters,
Post by: master2301 on May 25, 2020, 03:36:01 pm
Re-reference your listed part numbers on Baldwin website. Here is results BF593 is Secondary, BF592 Is Primary.
Title: Re: Primary and secondary fuel filters,
Post by: Journey, Roam, Explore on May 25, 2020, 03:47:01 pm
To polish fuel is to clean it through filters until all impurities water etc are removed. It's very common in boats where fuel could sit for long periods of time in a marine environment. It's not as necessary on a RV if you're driving it.
Title: Re: Primary and secondary fuel filters,
Post by: Rudy on May 25, 2020, 04:05:05 pm
"If you are driving it" is all important. Fix a heater for a Lousiana petroleum worker keeping his coach at the construction site. The fuel filter was full of alge due to not driving often enough. Polishing fixed him.
Title: Re: Primary and secondary fuel filters,
Post by: nitehawk on May 25, 2020, 04:24:04 pm
Kevin, on my 8.2 the filter mountings are NOT interchangeable. They are different size threads, etc so no mistake can be made when replacing.
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 04:55:37 pm
Ah OK, thanks just had a look, and one of the filters has got a bigger threaded hole ha ha, never even thought to look at that, how bloody simple ha ha, thanks a lot, while your here, when you usually change your fuel filter the one that fits on engine, when undoing the bowl does all the fuel run out and have to bleed the system again, or if I have the new filter already filled up almost to brim, and get it on quick enough, what are the chances of it starting without having to bleed system? Have you got any tips?
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 25, 2020, 05:02:40 pm
Ah OK, thanks just had a look, and one of the filters has got a bigger threaded hole ha ha, never even thought to look at that, how bloody simple ha ha, thanks a lot, while your here, when you usually change your fuel filter the one that fits on engine, when undoing the bowl does all the fuel run out and have to bleed the system again, or if I have the new filter already filled up almost to brim, and get it on quick enough, what are the chances of it starting without having to bleed system? Have you got any tips?
Also norm what make of filters do you use, I seem to be able to cross ref the filters and their are lots of different suppliers over here that I can get them from, I would rather use the best their is, if you got any suggestions, be handy if you could give me part nos for you primary and secondary filters
Title: Re: Primary and secondary fuel filters,
Post by: Chris m lang on May 25, 2020, 05:58:24 pm
kevo0000 A lot of people over here use WIX filters the NAPA gold filter is made by Wix if I'm not mistaken But like everything else each person has their favorite brand Chris
Title: Re: Primary and secondary fuel filters,
Post by: FourTravelers on May 25, 2020, 07:09:54 pm
I'll second the Napa recommendation. If you have a nearby NAPA store the Napa Gold are made by Wix. A great filter, been using them over 30 years on farm equipment.
Title: Re: Primary and secondary fuel filters,
Post by: Pierce & Gaylie Stewart on May 25, 2020, 08:25:15 pm
Wix/NAPA Gold is good. We only used Baldwin filters on the fire trucks. No Fram.
P
Title: Re: Primary and secondary fuel filters,
Post by: kevo0000 on May 26, 2020, 05:13:51 am
Follow the lines from the injector pump back to the closest filter. This filter is the secondary. Run the part number of the installed filter. It should show as 1-5 micron size. If the micron rating is over 5, you probably have the wrong filter. Follow the lines from this filter to the next further from the engine. This should be the Primary. The part number should show a micron rating around 10 -12.
The primary is 9 microns and the secondary is 5 microns I checked with baldwin, excellent customer services, had a reply this morning, so looks like I have correct filters thanks a lot
Title: Re: Primary and secondary fuel filters,
Post by: Chris m lang on May 27, 2020, 12:41:52 pm
No matter what the brand I wouldn't buy it from Walmart . Parts guy showed me a Fram that he sold and the exact same one from Walmart. The Walmart filter had about 1/2 the filter element in it. I buy lots of stuff from Walmart just not filters! Just me Chris
Title: Re: Primary and secondary fuel filters,
Post by: Pierce & Gaylie Stewart on May 27, 2020, 04:52:04 pm