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MG MGA - Fuel Filters / Fuel Regulators
I've heard and read lots of good stuff about fuel filter and fuel regulators and combined filter-regulators. One question that I can't seem to find an answer to is:
"But what size"?
I'm looking at getting a "Filter King" filter-regulator with a glass bowl, as I've heard they are pretty good and I think they would look good under the bonnet (yes, vanity has a part too).
They do 67mm and 85mm size. I think the 85mm would look too big (vanity again), but I've heard varying reports about the suitability of the 67mm version for larger engines (I have a slightly tweaked 2.1 litre).
Does anyone out there run a larger engine with a similar filter-regular, or know a bit more about them?
I run a Facet fuel pump. The fitting instructions advised fitting a filter/regulator so I fitted a Filter King under the bonnet on the vertical front of the lower firewall where the fuel line enters the engine compartment.
All has worked well for many years with my 1800 engine so I presume it's doing its job.
Mine is a solid type regulator, similar to attached image.
thanks for that. Do you know if it is the smaller or larger of the two sizes that they do?
I will check tonight.
|Filter King makes various models of filter-regulators, and any of them may be overkill for the MGA. The only reason you need a pressure regulator is if you have an aftermarket fuel pump that puts out too much pressure. Pressure in the range of 1.5 to 4.5 psi is acceptable.|
The MGA was built originally with no fuel filter. It has (had) a pencil size bug screen in the fuel pump, and thimble size screens in the carburetor float covers. The idea is to catch particles that might be too large to pass through the float valves or main jets. Original type float valves are very tolerant of small debris, generally "self washing" (but they do fail for other reasons). Gross Jet float valves may be a little less tolerant of medium size debris in the fuel (although they may otherwise last indefinitely with no wear).
If you have a dirty fuel tank (and choose to live with it), then you may need a fuel filter. Size for the filter is still not very important, as the smallest filter will pass enough fuel for an stock MG engine. Find one with 1/8-inch-NPT pipe thread ports (optional) and use 5/16-inch hose barbs. If you were particular about being neat you could pipe it into the hard lines.
The only size consideration is for how long it may take for the filter to become clogged. A larger filter may last longer between maintenance calls. To this end, if you expect a lot of trash, then even a large filter might get clogged up quicker than you like, which is when it becomes imperative to clean out the fuel tank.
If you think you I needed a larger fuel filter, then I would recommend a sediment bulb type filter with the see-through glass bowl and sintered bronze filter inside. See attached picture. The bowl will have capacity to hold lots of sediment while sintered filter element is pretty much self cleansing while being sloshed about with normal vehicle bump and vibration. When it does collect enough sediment, you can R&R the glass bowl to dump and rinse it in about minute without disturbing any of the fuel line connections.
The proper trick to keeping crap out of the carburetors is to keep the fuel tank clean. Once the tank is clean, if you drive a lot and flush lots of fuel through the system it should stay clean, and any small sediment will wash right through the fuel system. I have driven my MGA over 222,000 miles in the past 22 years (love those twos), and have never had any fuel clog problems. What the cars don't like is being left in long term storage with less than half a tank of fuel, which is when the tank may rust inside (especially with variable temperature and humidity). It is a big mistake to park it in the fall with one gallon of fuel intending to drain it in the spring.
If the fuel is relatively clean the size of the filter (or even the presence of a filter) is pretty much irrelevant. I have been running a finger size filter at the inlet to my aftermarket fuel pump. This filter gets changed when the fuel pump gets changed, every 100,000 miles or so. In other words, my car apparently does not need a fuel filter, but it's there just in case I might ever get a load of crap from a gas station.
Wise words from Barney.
I guess that as both my pump filter and Filter King filter are still clean after 12 years suggests that 1. my tank is clean and 2. I use a lot of fuel and drive the car daily.
I could not readily see any size details in the filter. However, I have posted a photo of its installation and the notes that came with it. Having read them, I am somewhat bemused to see that I should have mounted it away from engine vibration and heat - wrong on both counts, oh dear. Still, it seems to be doing its job okay. That said, the engine was running fine before it was fitted. It's there now, so it can stay!
http://www.mgaroadster.co.uk/odds_and_sods.htm top item
|Steve / Barney,|
Many thanks for your info. :-)
How do you connect your fuel pipes (nice braided ones I notice) to the filter king, as the only filter kings I've seen don't have screw-on connectors?
As I am having SU pump issues at the moment I am interested in your comment re: facet pumps. I take it that you are pleased with it. Is the pump mounted at the rear in place of the SU and which model have you used? I did read somewhere that it is possible to mount the two in series - one for use and one for back up, a "belt and braces approach" I know - any thoughts?
Yes, I used it as a direct replacement for the original pump during my original rebuild 12 years ago. It is mounted exactly where the SU pump was located. Other than checking the filter periodically (always totally clean) I have never touched it. In fact I have almost totally ignored it in the 12 years since. It clicks away quite happily just like the SU. I will check what model I have later today.
I will also have a look at connections to the Filter King for Gary.
Mine, bought in 1997 was a Facet Silver Top Fast Road Version; 18 gallon an hour flow rate, at 4 to 5.5 psi. I am guessing that because of that output they recommended a Filter King. They do a smaller version with a 12 gallon output that is closer to the SU on the MGA (10 gallon).
I have just looked at Holden Vintage on-line ( www.holden.co.uk - look at hardware - fuel pumps and fuel systems) and noticed that they have totally remodelled the shape of these standard Facets, although the competition versions still look much like mine.
Be sure to get the correct polarity pump for your car.
I am sure that many will now contribute to say that a restored or new SU pump is every bit as good. The choice is yours.
Gary, I bought the armoured rubber fuel pipes from Holden Vintage ( > Hardware > Fuel Systems > Fuel Pipe & Hose ). They are push-on pipes with hose clip end finishers - also from the same supplier. ( Hardware > Fuel Systems > Fuel Pipe & Hose Fittings ).
There are undoubtedly cheaper suppliers to Holden, but at least you can see what I am talking about.
This thread was discussed between 14/05/2009 and 15/05/2009
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