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willysmjeeps.com :: View topic - position of fuel filter
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position of fuel filter

 
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Wiltshireboy
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Joined: Jun 20, 2010
Posts: 76
Location: Wiltshire UK

PostPosted: Mon Feb 21, 2011 2:41 pm    Post subject: position of fuel filter Reply with quote

I need to put an in line filter in. Should I put it just before the carb or before the fuel pump?
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Andy
M38A1 & M416A1 trailer
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wesk
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Joined: Apr 04, 2005
Posts: 15585
Location: Wisconsin

PostPosted: Mon Feb 21, 2011 2:55 pm    Post subject: Reply with quote

It should be on the inlet side of the fuel pump. However if you have a good military filter in the tank then you shouldn't need to add one in line.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Wiltshireboy
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Location: Wiltshire UK

PostPosted: Mon Feb 21, 2011 4:54 pm    Post subject: Reply with quote

I have a new intank filter, but very fine rust seems to be getting through. I saw it in the float bowl of the carb. Seems to me that the old style filter is not that good, so thought a modern inline one would do better?
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wesk
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PostPosted: Mon Feb 21, 2011 10:02 pm    Post subject: Reply with quote

That very fine rust could be from the steel tubing. The tank filter should stop any fine rust. It won't hurt to run the second filter.

I hate to see folks just cut the tube and slip the filter in with two pieces of hose. It's better to maintain the integrity of the system and use an 1/8" P nipple between the fuel filter and the fuel pump and then move the 1/8"P nipple with inverted flare tube adapter to the other side of the filter and reconnect the original tube there by just bending the tube a bit to shorten it.
Of course you will need to buy a filter with threaded ports.

Another alternative is to use the WWII MB firewall mounted filter and bracket.
[img]http://img.mypicgallery.com/Default.aspx?/HoldenAmbulance/dscn0237_large.jpg&d=1[/img]

Or buy a CJ3A dual fuel/vac pump with the glass bowl filter built in right on top.
[img]http://img.mypicgallery.com/Default.aspx?/jeepfuelsystem/fuelpump_large.jpg&d=1[/img]
[img]http://img.mypicgallery.com/Default.aspx?/jeepfuelsystem/dscn0021_large.jpg&d=1[/img]
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Cacti_Ken
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Joined: Apr 20, 2005
Posts: 1017
Location: Silsbee, Texas

PostPosted: Tue Feb 22, 2011 10:19 pm    Post subject: Reply with quote

I put an inline fuel filter on the inlet of the pump. I had to use rubber hose because I could not find the filter with inverted V and or 1/8" pipe threads. If anyone out there has a part number for one please pass it to me. I prefer tubing screw connections over rubber hose.
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wesk
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Location: Wisconsin

PostPosted: Wed Feb 23, 2011 12:24 am    Post subject: Reply with quote

There's a pretty good selection of threaded port fuel filters out there.

Hi performance catalogs carry them but most are 3/8" P which is simple to reduce to 1/8" p or adapt 3/8"P to inverted flare.
http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?langId=-1&Ntk=PartType_x&catalogId=10002&sendroiad=3824181791&Nty=0&sendroicid=bbef8492-2d00-41d6-b158-38db0de2603c&No=12&I=p&gclid=CJaQl-jLnacCFYh_5Qod_wuBeQ&sendroikwd=In-Line%20Fuel%20Filters&Ne=1%202%203%202500000%201147708&Ntt=^Fuel+Filter^&storeId=10001&Ntx=mode%20matchboolean&N=0&redirect=false

[img]http://www.jegs.com/p/Aeromotive/Aeromotive-In-Line-Fuel-Filters/750079/10002/-1[/img]
3/8"P inlets

http://www.jegs.com/images/photos/0/037/037-GF652.jpg


Here's an Edelbrock with 1/8" P inlets.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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SteveJ
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Joined: Jun 14, 2005
Posts: 110
Location: Calgary Alberta

PostPosted: Thu Feb 24, 2011 9:11 pm    Post subject: Reply with quote

Ive always used the military filter in the tank. It works good and lasts a long time and Ive never had a fuel delivery problem in the 14 years Ive been running my M38. I find that the inline one especially between the pump and the carb tends to look out of place on the military jeep.Smile

Though those inline ones that Wes has pictured looks pretty slick and it would save digging in the tank to change the filter.

Maintenance schedule says 6 months or 6000 miles and clean the military filter.
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1986 CDN Armstron MT500 dispatch Motorcycle
1986 arrow 1.75 t cargo trailer
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1952 M38 CDN W/W (Sold)
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wesk
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Location: Wisconsin

PostPosted: Thu Feb 24, 2011 9:58 pm    Post subject: Reply with quote

As I posted in my first post and Steve posted above the military in tank filter system served the jeep well for half a century. If you are getting rust in your carb then the in tank filter system or delivery plumbing has failed and that issue should be addressed instead of placing a downstream band aid on the engine. The existence of the rust itself is a defect that needs to be fixed and not covered up. Perforated fuel pickup plumbing in the tank can take rusty residue from the tank to your carb effectively bypassing the in tank filter.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php


Last edited by wesk on Sun Feb 27, 2011 7:59 am; edited 1 time in total
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Wiltshireboy
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Joined: Jun 20, 2010
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Location: Wiltshire UK

PostPosted: Sun Feb 27, 2011 7:03 am    Post subject: Reply with quote

thanks guys. I will look at this. Andy
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