Crap fuel and after market fuel filter posistioning and

**matpoli** · 23rd October 2009, 08:36 PM

Hey guys,

I went for a drive in the Swan Valley last weekend (wine Region in WA) and I put some fuel in from a no name random fuel station, stupid mistake.

Anyway there must of been sediment in it and my Series 2 started running really badly, almost like a miss. I put some BP fuel in to try and lean it down as I thought it might of been a methanol issue but it didn't help. It wouldn't even idle.

When I got home I changed the plugs, re-gaped the points and checked the leads as although I thought it was the fuel I wanted to eliminate another variable. The result was that it still ran badly.

Then I cleaned out the fuel bowl (noticing that I didn't have a gauze filter in there like in the manual), I also noticed that there was a metallic, almost gun power like substance in there at the base of the bowl. I also undid the fuel line where it entered the carby and removed the main jet and fuel bowl. I then blew air through where ever I could.

I turned the car over with the crank handle to flush some fuel out and reassembled it all.

On starting it ran beautifully, idled like a dream. I went for a quick drive and it started back firing again and wouldn't idle, so I gathered that it was definitely bad fuel or sediment.

I then drained all the fuel out of the tank and flushed it with the filtered fuel and went a bought an after market inline fuel filter and this is when my indecision started.

My dad got involved at this point as he was an aircraft mechanic and is a perfectionist. He has asked four yes 4 motor mechanics about the placement of the new filter and we got this:

2 have said between the fuel tank and the fuel pump, so in essence the fuel will be "sucked" through the filter;
2 said it should go between the fuel pump and the carby so it gets "pushed" through the filter.

Sooo...... Has anyone undertaken this exercise themselves, where did you put it and what was the result?

Any other advice? And sorry that the post is so long I just thought I would try and cover all bases. Oh and one more thing i Have a holden carby on it so any zenith etc examples may be null and void.

Thx guys

**HowardSmall** · 25th October 2009, 04:08 PM

I think I'd go with the majority

Actually I don't know the answer or if there is a correct one but mine has an in-line filter between the pump and the carby - it was there when I bought it. Seems to work fine...

The biggest plus that I see with it being there is it is easy to get to. So checking and replacing are not major chores.

I will watch this post with interest.

Howard

**HBWC** · 25th October 2009, 04:20 PM

i'm with the first desition i'd put it befor the pump to help save that as well

**Lucus** · 25th October 2009, 04:23 PM

If you going to use the cheapo ryco inline fuel filters i would but a filter in each position. It certainly isn't going to hurt!

**JDNSW** · 25th October 2009, 04:42 PM

Fuel filters in general should go after the pump, as the increased restriction is more likely to lead to vapour lock if before the pump. And you already have the screen on the pickup pipe in the tank (might be worth having a look at this) and the screen in the sediment bowl on the fuel pump. Between them these should stop anything that will cause problems with the pump.

My in-line filter is placed between the pump and the carburetter.

John

**matpoli** · 27th October 2009, 01:17 AM

Originally Posted by JDNSW

Fuel filters in general should go after the pump, as the increased restriction is more likely to lead to vapour lock if before the pump. And you already have the screen on the pickup pipe in the tank (might be worth having a look at this) and the screen in the sediment bowl on the fuel pump. Between them these should stop anything that will cause problems with the pump.

My in-line filter is placed between the pump and the carburetor.

John

Hmm it seems that the majority believe that it should go between the carby and the pump. I got impatient in the mean time and actually fitted it under the passenger foot well between the pump and the tank unfortunately.

I was concerned that the heat from the manifolds might damage the filter in some way. I took the top off the carby and cleaned it out and noticed that one of the idle mixture holes in the bottom neck of the carby was blocked. I removed that and the main jet and flushed out the bowl as well.

It is a lot better now but there is a small flat spot which appears between gear changes I still need to eliminate.

I didn't know there was a screen on the pickup in the tank but I do notice that when the fuel gets low it rattles so I may take a look at that. I also don't have a screen in the sediment bowl so I might have to try and source one of those as well from somewhere.

It's not too late to move it though as I can always patch up the pipe where I cut it with some fuel hose. Oh and if anyone wants to fit a filter I bought a mini hose cutter from Bunnings for $14 so that I didn't hacksaw it and get more fillings in the fuel.

Mat

**Wolfman_TWP** · 27th October 2009, 11:50 AM

It may not be a LR, but I have my fathers Nissan Vanette and it's fuel filter is between the tank and pump, by design.. Although I would also put one between the pump and carby as well.. Just incase some crud does make it passed the pump.

Wolf

Chris Fehrenbach · 4th November 2009, 08:04 PM

I am just about to fit the RYCO between the pump and Tank in my 68 2A it hasn't started for 4 years so I am having some difficulty as you can imagine. It has an electric pump and CD175 Carby that seems OK and Spark.
I have to flush out the old fuel from the bowl with the new fuel (the old stuff can go in my Ford) I will keep you all posted.
Cheers from Chris

**Blknight.aus** · 5th November 2009, 12:13 AM

what you need is a fuel water seperator and not a filter as close to the tank as you can then you want what I would call a strainer (any filter with over 50 micron rating) then you want the pump and finally a decent filter (any filter with 30 micron or lower)

the cheap plastic filters from places like supercheap that are $3 a pop are colanders or gravel traps and thats about it.

**peterg1001** · 5th November 2009, 04:50 AM

There's some useful information in here:

Fuel Filter Selection

Peter

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