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Thread: Ferret Fuel Pump Woes

  1. #11
    Join Date
    Aug 2016
    Location
    North East England
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    470

    Default Re: Ferret Fuel Pump Woes

    Am i right in thinking it primes up manually, but does not pump fuel when running

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  3. #12
    Join Date
    Jan 2012
    Location
    Victoria, Australia
    Posts
    143

    Default Re: Ferret Fuel Pump Woes

    A few queries along these lines, if I may.

    1. I've taken the (ferret) tank out to clean it. Not sure if the pump is 100% so I plan to connect the input hose to a can of fuel, disconnect the hose to the carbie and run that into a can, then crank the engine. Is there a measure of ml/min or PSI to see if it's working, or just be happy if fuel squirts out?

    2. I've purchased a hand priming pump (the rubber bulbs that you get at marine shops) to put between the LHS tank outlet and the filter, with another filter on the suction side. This needs to be low down in the fighting compartment (i.e. near the bottom of the tank) so will need to get a short length of metal pipe with the swelling on the end, to save chopping up the existing pipe, to connect flexible hose. Imagine pipe is readily available (but haven't checked yet).

    3. The other option is an electric pump in the same position as (2) - I guess a 12V pump is suitable, rather than 24V? However on Googling the warning is to wire it so that it stops pumping if the engine stalls. The tachometer circuit is one suggestion and it certainly seems sensible to not keep pumping fuel if the engine stops for whatever reason, but this is getting a bit complicated for me. You'd hope that the carbie would stop fuel flooding everywhere but I'm not sure.

    4. Plan to modify the banjo connection as suggested by "Grasshopper" to increase the hight of the fuel pickup a bit. Haven't looked at it yet but assume a bit of flexible fuel pipe would be OK for this?

    5. Agree absolutely with the problem of air leakage. The fuel pump needs to pull fuel from the bottom of the tank to the filter near the top of the tank before it starts flowing down to the pump. Any air leakage makes this difficult or impossible. I've found one culprit connection, which was part of my problems and is why I'm planning option 2.

  4. #13
    Join Date
    Sep 2005
    Location
    Kent, England
    Posts
    10,569

    Default Re: Ferret Fuel Pump Woes

    Quote Originally Posted by Aussie View Post
    A few queries along these lines, if I may.




    3. The other option is an electric pump in the same position as (2) - I guess a 12V pump is suitable, rather than 24V? However on Googling the warning is to wire it so that it stops pumping if the engine stalls. The tachometer circuit is one suggestion and it certainly seems sensible to not keep pumping fuel if the engine stops for whatever reason, but this is getting a bit complicated for me. You'd hope that the carbie would stop fuel flooding everywhere but I'm not sure.
    Using the tachometer to switch off the pump will not work as it is cable driven ...... not electric.
    Richard Farrant

    1943 Bedford QLD - 1941 BSA WM20 - 1943 Daimler Scout Car Mk.2
    MVT no. 1087 - IMPS no. 57 - AMVCS hon. member and Comms. officer
    KVE President and Newsletter Editor

  5. #14
    Join Date
    Jan 2015
    Location
    Sydney, Australia
    Age
    64
    Posts
    38

    Default Re: Ferret Fuel Pump Woes

    If you install a tachometric relay (as used in LPG vehicles) you can take the pulse from the distributor.

    How it works is once the ignition is turned on the relay allows the fuel pump to run for a few seconds then shuts it down. This creates fuel pressure to start the engine, once started the pulse of the low tension circuit to the distributor keeps the relay operating.

    Once the pulse stops (the engine stops turning over) it shuts down the fuel flow.

    This means in the event of a ruptured fuel line after the pump the engine will stop and so will the pump.

    Relays are avaialable on eBay and cost around 30-40 Aussie $.

    I use them on modified fuel injected cars, but they will work with a carby just as well.

  6. #15
    Join Date
    Jun 2010
    Location
    Portsmouth, UK
    Posts
    2,402

    Default Re: Ferret Fuel Pump Woes

    Once you've fixed the immediate problem there's nothing wrong with retaining the existing pump arrangement. Personally I like the idea of turning the engine over to get the oil pressure up a bit before it starts.

    Andy

  7. #16
    Join Date
    Jul 2015
    Location
    New Jersey, USA
    Posts
    104

    Default Re: Ferret Fuel Pump Woes

    Same here Andy. If I give the accelerator a couple pumps it would fire right away. Instead I don't touch the pedal, and I crank it till the oil light goes out. Then I hit the pedal and it starts. I do this mostly with the 2 speed generator in mind since oiling that before a start is indicated in the manuals.

  8. #17
    Join Date
    Dec 2009
    Location
    Wiltshire
    Posts
    119

    Default Re: Ferret Fuel Pump Woes

    Quote Originally Posted by 64EK26 View Post
    Hi

    Have spent a bit of time (along with others) in trying to sort out a Ferret Fuel Pump problem.

    The conclusion we have reached is that the pump is not pumping when fitted to the engine. The pump works fine when it off the engine. When fitted to the engine, Fuel filter bled and fuel lines primed no fuel is reaching the carb.

    The fuel pump is driven via a push rod and cam in the engine, are these prone to wear ?

    Also what 24V electric fuel pump can anyone recommend and where is the best place to fit one ?

    Cheers
    Richard
    Hi Richard when the mechanical pump is on form it works fine . problems occur as the cam that drives it wears or the diaphragm is torn due to bad / incorrect fitting or perished diaphragm. Smell your dip stick does it smell of petrol. I am with the guy,s get an electric pump . I fit two , one as a back up. I put the switches in obscure places they act as an ant- theft device. Starting is great . Its better than pumping petrol oil around and having to replace big and main ends not to mention cams , bearings ,push rods and oil passing past oil seals.

    regards
    Laurence

  9. #18
    Join Date
    Dec 2008
    Location
    Fareham Hants
    Posts
    173

    Default Re: Ferret Fuel Pump Woes

    Hi

    Thanks for all the advice

    We have finally got it working...

    The pump has been on and off many times and the rebuild was checked, still not sure what we have done differently. I still think that an electric pump is the way to go, just got to persuade the others.

    Cheers
    Richard

  10. #19
    Join Date
    Feb 2007
    Location
    London
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    39
    Posts
    1,573

    Default Re: Ferret Fuel Pump Woes

    I've found some fuel pumps on old petrol vehicles like to have the valves wet before they'll work properly. I get very bored of the taste of petrol...
    1971 AMG MUTT M151A2

    Previously owned MVs- 3x LR 101 GS, 110 V8, Chevrolet Blazer K5, HD Wolf TUM, 3x Matadors, Zil 131, Ferret Mk1, Sankey trailer, Freuhoff Tilt bed recovery trailer

    Ward LaFrance crew member A&E 2010, 2012

    Qualified coal-hoofing spade-waver, Bluebell Railway 2015

  11. #20
    Join Date
    Oct 2013
    Location
    Adelaide, South Australia
    Age
    37
    Posts
    1,086

    Default Re: Ferret Fuel Pump Woes

    Realistically, diaphragm pumps are very reliable and have been keeping Ferrets going for over 50 years so far. The only things that can really go wrong with them are torn diaphragms and/or a stuck valve. In either case, a rebuild is a fairly simple procedure.

    http://ferret-fv701.co.uk/mnuls/david_pump.pdf

    An electric pump really isn't necessary.

    Cheers,
    Terry
    82 BA 88 - Alvis Saracen Mk 5 APC VHF GPMG
    00 BB 81 - Daimler Ferret Mk 2 (115286)
    01 BB 07 - Daimler Ferret Mk 2 (115292)
    http://military-vehicle-museum.org.au

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