Fuel filter, Before or after mechanical pump? - Team Camaro Tech
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post #1 of 18 (permalink) Old Jun 29th, 10, 07:35 AM Thread Starter
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Fuel filter, Before or after mechanical pump?

Does it matter which side of the fuel pump I put the filter?, I would like to put it on the Inlet to the pump because it would be out of the heat from the motor. When I had the aluminum edelbrock filter beside the carb it gets really hot and concerns me. Will it be OK in either spot?

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post #2 of 18 (permalink) Old Jun 29th, 10, 07:37 AM
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Re: Fuel filter, Before or after mechanical pump?

I don't think that it really matters.

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post #3 of 18 (permalink) Old Jun 29th, 10, 07:57 AM
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Re: Fuel filter, Before or after mechanical pump?

After the pump.The pump doesn't have alot of suction and if the filter starts getting clog your pressure will drop off alot faster with the filter on the suction side.Low pressure = lean bad on a high performance engine.
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post #4 of 18 (permalink) Old Jun 29th, 10, 02:34 PM
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Re: Fuel filter, Before or after mechanical pump?

Be carefull with filters some are designed as 'sucj thru' , others 'pump thru' and make sure they are the right way around.
I mounted mine in the rubber section up behind the rear wheel....used an elcheapo after reassembling the car....after a couple 1000 miles I replaced it simply out of 'good practice'.

Quote:
The pump doesn't have alot of suction and if the filter starts getting clog your pressure will drop off alot faster .....
Filters should be replaced as routine maintaince, not wait till the bloody thing effects performance, espec on a high end performance car.....Too many people over look take for granted the simple stuff, like air filters, pvc valves, radiators and fuel filters.
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post #5 of 18 (permalink) Old Jun 29th, 10, 03:04 PM
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Re: Fuel filter, Before or after mechanical pump?

The factory put them after the pump for a reason. Put it before the pump and you will almost surely have a fuel starvation problem.

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post #6 of 18 (permalink) Old Jun 29th, 10, 11:54 PM
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Re: Fuel filter, Before or after mechanical pump?

40 yrs ago all you could get was pressure filters.....
I have swapped all my cars, including the vinage cars over to suck, got p155ed picking up crap in tanks and messing with the non return valves in the pumps.
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post #7 of 18 (permalink) Old Jun 30th, 10, 02:07 AM
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Re: Fuel filter, Before or after mechanical pump?

after the pump most definatly. if your fuel pump diaphragm breaks up or even worse has a catastrophic failure i would prefer all the debris ( possibly metal) going into a filter before it gets to the carb/motor.
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post #8 of 18 (permalink) Old Jun 30th, 10, 02:33 PM
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Re: Fuel filter, Before or after mechanical pump?

Diapham brks up, bowls my out engine stops...bit if there is no sintered filter have to get past the float valve, out of the bowl, thru gallerries and thru jets etc.
Arguement doesnt hold water.
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post #9 of 18 (permalink) Old Jun 30th, 10, 03:11 PM Thread Starter
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Re: Fuel filter, Before or after mechanical pump?

I have ordered fittings and -6an hose to install the filter after the pump, thanks

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post #10 of 18 (permalink) Old Jun 30th, 10, 03:12 PM
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Re: Fuel filter, Before or after mechanical pump?

Quote:
Originally Posted by Alberta69SS View Post
I have ordered fittings and -6an hose to install the filter after the pump, thanks
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post #11 of 18 (permalink) Old Jul 1st, 10, 02:56 AM
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Re: Fuel filter, Before or after mechanical pump?

Quote:
Originally Posted by Steptoe View Post
Diapham brks up, bowls my out engine stops...bit if there is no sintered filter have to get past the float valve, out of the bowl, thru gallerries and thru jets etc.
Arguement doesnt hold water.

can you write it in english now please steptoe
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post #12 of 18 (permalink) Old Jul 1st, 10, 02:39 PM
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Re: Fuel filter, Before or after mechanical pump?

Diapham brks up, bowls mt out engine stops...but if there is no sintered filter it has to get past the float valve, out of the bowl, thru gallerries and thru jets etc.
Arguement doesnt hold water.

Sry didnt have my glasses on.
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post #13 of 18 (permalink) Old Jul 2nd, 10, 09:06 AM
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Re: Fuel filter, Before or after mechanical pump?

Quote:
Originally Posted by Steptoe View Post
Diapham brks up, bowls mt out engine stops...but if there is no sintered filter it has to get past the float valve, out of the bowl, thru gallerries and thru jets etc.
Arguement doesnt hold water.

Sry didnt have my glasses on.

if it happens you can clean out a carb if you want but i would rather just clean the filter.
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post #14 of 18 (permalink) Old Jul 2nd, 10, 11:57 AM
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Re: Fuel filter, Before or after mechanical pump?

FYI - I use the bronze filters that fit into the inlets on my Holley. The sock in the tank and those filters, nothing else. Thousands of miles w/o problems. I believe GM did the same with the Holley, Q-jet and 2-jet (paper inlet filters).
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post #15 of 18 (permalink) Old Jul 2nd, 10, 03:44 PM
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Re: Fuel filter, Before or after mechanical pump?

I agree with the above...problems arise after a rebuild and the tank lines etc have been laying around dry for a while...Then filters come into action.
Generally most of the crap comes from the tank..hence why I put a suction in the rubber section behind the wheel...and yep I did get a little crap in the float valves a cuople times in the 1st few 100 miles.
I expected a liitle crap in the float valves, a 10 min stop on the road trip to fix, no big deal.
I reeplaced the filter because I brought 2 at the time with that intention, and was easier to replaced in the rubber section than replace the rubber section.
Then went to LPG, and dont have a fuel pump or even a petrol tank anymore.
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