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  #1   IP: 173.230.183.5
Old 05-27-2021, 10:29 AM
campbdon campbdon is offline
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Red face Order of Devices in the Fuel Line

Hi everyone! I've been really poring over the really helpful articles and discussions on this site. Working through starting up issues at the moment.

My current setup on the fuel side is Fuel tank -> Shutoff switch -> Fuel Hose (1/4" ID) -> Facet Elect Fuel Pump -> Inline automotive filter (seems like quite coarse) -> Carb.

I am considering adding a polishing inline filter, and do understand that coarser grade filtering must precede finer, so which do you suggest as the preferred option:
a) Insert the polishing filter between the carb and current filter, or
b) Move the existing filter to before the pump and install polishing filter where original was (between pump and carb)

Seems to me (b) would help keep any larger debris from reaching the pump, etc. Should , let's say, a 5-micron coarseness be sufficient? The existing one must be well over 10. Or instead, adding a fuel/water separator (eg: Racor) but don't yet have any suspicion of water in the fuel.

Thanks for any advice,
DonC
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Old 05-27-2021, 10:41 AM
W2ET W2ET is offline
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Off the topic, but does this raise any eyebrows?
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  #3   IP: 155.186.122.195
Old 05-27-2021, 10:42 AM
Dave Neptune Dave Neptune is offline
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First welcome to the MMI Afourian Forum.

My preference is like this ~ tank ~ shut off valve ~ filter/water separator ~ fuel pump ~ polishing filter. This way the pump get clean water free fuel, this will keep the fuel pump happier and debris free.

Also while pondering future diagnosing and tuning I strongly suggest a "REMOTE START SWITCH" as it is very handy for all diagnostics.

Also keep in mind when working on the A-4 keep the water valve closed so water does not fill the exhaust and get into the engine.

Dave Neptune
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Old 05-27-2021, 10:47 AM
Dave Neptune Dave Neptune is offline
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Question

Bill, what do you see? I see a clamp almost off the end of the hose and the throttle arm rubs the fuel line, not real good.

Dave Neptune
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Old 05-27-2021, 11:21 AM
W2ET W2ET is offline
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Hi, Dave:

It looks to me like the hose is too big for the fitting, making up for the difference in diameters by overtightening the hose clamp (and potentially weakening the hose, especially with that bend at the end).

Bill

Last edited by W2ET; 05-28-2021 at 09:39 AM.
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Old 05-27-2021, 04:42 PM
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Peter Peter is offline
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Hi,

I would replace all the fuel lines while I was at it. Removing the old lines from barbed fittings often tears up the inside of the line leaving little chunks of rubber that can gum up the carburetor.

Please make sure you use coast guard approved fuel lines.

New, correctly sized fuel lines ensure a nice clean supply of gas AND gives you great peace of mind that you will not be subject to fuel leaks.

Hope that helps,

Peter
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Old 05-28-2021, 09:43 AM
campbdon campbdon is offline
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Order of Devices...

Thanks all for the advice.
Mr Neptune, I especially read all your stuff! I am planning to replace all the fuel lines (the run from the tank to the pump was only 1/4" ID, not the recommended 5/16") with the USCG approved stuff. If water is not suspected as an issue, rather than adding a water/fuel separator, is there anything "wrong" with moving the coarser filter in front of the pump and adding a finer one after that (either before or after the pump)? If I decide to get the separator must it mount on a bulkhead? I don't see where on the engine block that could attach? Also intend to switch the fuel from the regular 87 to 91 to reduce the ethanol content.
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