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V-8 Engine Tech

Mk3 Fuel Filter location

Mopar Big Block Talk

by johnw » Sat Apr 06, 2019 3:10 pm

I have been working on a US Spec Mk3 440. The fuel filter is attached to the bottom of the fuel pump with a bracket, and the output of the pump is filtered before being fed into the carb. Is this the stock setup on a Mk3? I am used to the filter being inline before the pump on earlier cars.
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by Frank Schwartz » Sat Apr 06, 2019 5:36 pm

On my MKIII the filter is mounted along the frame rail a few feet before it is fed into the pump.... Have you looked up under there?
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by johnw » Sat Apr 06, 2019 7:31 pm

Frank Schwartz wrote:On my MKIII the filter is mounted along the frame rail a few feet before it is fed into the pump.... Have you looked up under there?
Frank

I haven't looked there. I didn't expect there to be two. Your description fits the Mk1's location. Is yours a 383?
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by RockyUSA » Sun Apr 07, 2019 3:53 am

Is that possibly the vapor separator?

I thought those were stock on the Mopar motors.

A picture is worth a thousand words.

OBTW: A stock Mopar vapor separator is about $100 if you can find one. It includes a filter function, as I predict SC1 will point out! :D

note these pix are from the interwebs, and not off my car....

Mechanical_Fuel_Pump_Configuration_BB_Chrysler_02.jpg
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Mechanical_Fuel_Pump_Configuration_BB_Chrysler_01.jpg
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Last edited by RockyUSA on Sun Apr 07, 2019 5:29 am, edited 1 time in total.
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by slotcarone » Sun Apr 07, 2019 4:16 am

The part next to the fuel pump that has a line on each end and the smaller one on the side is also a fuel filter. A very common part on most Mopars of this era. :)
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by johnw » Sun Apr 07, 2019 11:59 am

Thanks both of you. So that is exactly what it is, a stock fuel separator setup more or less like that. I suppose we can't effectively clean the filter in it. Hopefully it is clean enough in there. The bracket and pump is slightly different to the photo, more like the setup in the manual, although higher up that seems to be feeding a dual quad setup! 8)

We are after the lower "Fuel Supply Tube" detailed on the diagram. In fact all the pipework would be nice. Does anyone sell the pipework premade? I have a brake pipe flaring kit, but never used it to make steel fuel pipes. I have seen that Jegs sell some premade pipes, but they were for earlier cars without a vapour separator.
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by RockyUSA » Sun Apr 07, 2019 3:23 pm

My bet I that you are going to have to bend it yourself. I only have this as a historical reference - I don't have a separator like this. Shouldn't be too bad if you can bend and flare the tube out of the car, just takes some practice. Good Luck.

My guess is that this isn't the "primary" fuel filter - I would hope there is one downstream, as well.

Since you have this expensive vapor separator, it seems only logical you will want to go with a Dual Quad setup - if only for the "bench racing" factor!

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by slotcarone » Sun Apr 07, 2019 4:37 pm

I have something different on my Interceptor. It may have been done by the previous owner. :)
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by Joe Schiavone » Sun Jun 23, 2019 1:52 pm

I believe possibly the vapor separator may be he big black container on the right side behind the head lamps. No fuel filter in that black canaster. May be wrong. RacerJoe
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