 Fuel Filter - before or after pump?, seen it both ways |
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| BCinSC |
 May 31 2005, 07:19 AM
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#1
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Nothing but Trouble  Group: Members Posts: 138 Joined: 8-June 03 From: Wakefield, MA Member No.: 800 Region Association: North East States  |
I figured before to prevent tank gunk from ruining pump, but pump gunk, should it ever fail, could kill FI.
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| d914 |
May 31 2005, 07:42 AM
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#2
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Advanced Member Group: Members Posts: 2,331 Joined: 12-July 03 From: Atlanta, ga Member No.: 904 Region Association: South East States |
I'm not a FI guru, insert legal qualifiers here, my car is carb'd and I have filters on both sides. I hate dirt jets...
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| BCinSC |
May 31 2005, 08:05 AM
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#3
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Nothing but Trouble Group: Members Posts: 138 Joined: 8-June 03 From: Wakefield, MA Member No.: 800 Region Association: North East States |
Is silly OEM square filter required, or can I use some other?
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| d914 |
May 31 2005, 08:09 AM
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#4
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Advanced Member Group: Members Posts: 2,331 Joined: 12-July 03 From: Atlanta, ga Member No.: 904 Region Association: South East States |
FI or carb???? if FI i'll differ, my quick answer would be there are after market filters out there. Carb no problem...
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| Joe Bob |
May 31 2005, 08:36 AM
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#5
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Carbs run on low pressure so the cheapo clear plastic ones will work.
FI runs on signifcantly higher pressure and if on the pump side needs one designed for FI. They are usually metal clad. |
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| CptTripps |
May 31 2005, 08:44 AM
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#6
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:: Punch and Pie :: Group: Members Posts: 3,584 Joined: 26-December 04 From: Mentor, OH Member No.: 3,342 Region Association: Upper MidWest |
I have the clear-plastic FRAM one AFTER the pump. I have the pump up front, and the filter in the engine bay. Only because I didn't have room up front. I think I'm going to re-locate it up front when I re-config the lines. I'll need to pull the tank to do it though.
BTW: I'm running carbs, it'll be different with FI. |
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| rhodyguy |
May 31 2005, 10:15 AM
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#7
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,080 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
before pump. forget those little cone shaped, cheapo, type 1 style filters. jmho.
k |
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| Reiche |
May 31 2005, 12:46 PM
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#8
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Member Group: Members Posts: 169 Joined: 13-October 04 From: Vista, CA Member No.: 2,934 |
For FI, always before the pump. Although it's possible, I have never heard of a roller pump failing catastrophically enough to take out the rest of the fuel system. OTOH, inadequate filtration of tank gunk will kill a pump in a few thousand miles. FI roller pumps have very close tolerances and high flow, and their filters need to accommodate both. Use the stock filter (or something equivalent) for stock pumps, always.
As for pumps for carbs, I would check with the manufacturer. |
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| fadler1 |
May 31 2005, 02:58 PM
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#9
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Newbie Group: Members Posts: 24 Joined: 30-June 04 From: San Diego, CA Member No.: 2,278 |
Add one "horror story" which follows one of the previous posts. My '71 was sputtering and stopping without fuel flow so I figured the first cheap thing is the filter (yes the square one). I caused the smallest of constrictions in that crappy PVC line and "voila" killed the pump. Easy to do. Be careful since the silly square thing slips into a welded bracket which on mine was corroded. Long story short, replaced the fuel lines with decent ones (no possible fire hazard), rebuilt pump, recalibrated MPS, new distributor, new electronic point systems and with my hydraulic cam and valves, a much better running machine which needs much less adjustment.
Just be careful with that fuel filter. What seems like a $4.95 fix can turn into a major headache, especially since most of the parts are now obsolete and no longer available even at Pelican. Attached image(s) 
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