 Two in-line fuel filters, Is this a problem for 3.5 psi rotary fuel pump? |
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| dcecc1968 |
 Dec 23 2019, 10:15 AM
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#1
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Member  Group: Members Posts: 253 Joined: 31-December 12 From: Concord, NC Member No.: 15,313 Region Association: South East States  |
I have a 1.7 dual-carbed set up and I'm getting ready to change my facet fuel pump for a CMB rotary fuel pump. The PO moved the fuel filter to the top of the engine for ease of access, but my new CMB pump has one installed at the pump that is "supposed" to remain or the 1-yr warranty is invalidated.
Is it a problem to leave both filters in place or will that create too much pressure drop. I'm trying to do the pump switch-out without having to cut / re-plumb the fuel hosing. Also, is it better to have the fuel filter between the tank and pump or between the pump and carbs? |
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| SirAndy |
Dec 23 2019, 10:30 AM
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Resident German Group: Admin Posts: 41,943 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
The filter should be before the pump. I'd say remove the one in the engine bay.
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| rhodyguy |
Dec 23 2019, 10:35 AM
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#3
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,193 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Change the crimped clamps and short piece of hose on the filter to pump. New short piece of fuel line and stock shouldered clamps. Imho the second filter between the pump and carbs is not needed if you start with a clean fuel tank and a NEW in tank mesh/filter sock. Rotary914 usually has the socks and fiber washers in stock.
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| dcecc1968 |
Dec 24 2019, 07:23 AM
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#4
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Member Group: Members Posts: 253 Joined: 31-December 12 From: Concord, NC Member No.: 15,313 Region Association: South East States |
Thanks for response fellas. I figured that was going to be the answer. Guess I need to get some fuel line so I can remove the second filter.
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| michael7810 |
Dec 24 2019, 08:22 AM
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#5
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Senior Member Group: Members Posts: 1,082 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region 
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I don’t think there is any hurry. I’ve been running the rotary pump & filter up front with 2 more filters in the engine compartment for about 5 years now. I agree fuel filters are not recommended in the engine compartment and will remove mine the next time I change the fuel hoses.
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| dcecc1968 |
Jan 4 2020, 07:15 AM
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#6
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Member Group: Members Posts: 253 Joined: 31-December 12 From: Concord, NC Member No.: 15,313 Region Association: South East States |
thanks Michael. Nice to know I can put the new fuel pump in and drive for a while
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