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Petrol Filters - warning

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  • Petrol Filters - warning

    Hi Guys
    I thought I would pass on my recent experience of a problem with my 1998 Hunter (2 litre DOHC Scorpio and solid state electrics). Until a few weeks ago I didn't know my car has one filter, let alone two! I'm usually dead keen on maintenance, and at an early stage of my 4 year ownership I established that my car did not have a visible petrol filter. On reflection, this was a bit stupid , but how was I to know that the Marlin factory hid two filters under the car, and that it also has two petrol pumps!

    After four years of relatively trouble-free motoring, one day for the first time ever it broke down. Lots of engine misfire and bangs from the exhaust. Long story - short: Called out the AA and they towed me to my local village garage (who are real enthusiasts). Thought it best to get their opinion rather than have a dead car on my driveway, and then face the problem by myself. The garage-guys diagnosed a lack of petrol going to the engine, and replaced the baked-bean size filter underneath the front pump. A couple of journeys later, ironically exactly a week later, same problem occurred with car being towed to my village garage by the AA again.

    The garage guys had previously suggested that the rear pump was possibly on its last (I didn't know about this pump), and with my agreement found a source after a few days and fitted a new pump. In the process, they realised that in line with the pump was another filter about the size of a small cigar and absolutely bunged up with muck. How petrol got through it in recent journeys I have no idea. Anyway, another day of sourcing a replacement, fitted it, and Bob's your uncle - the car now goes well.

    I could have done all of this work myself, except I didn't have access to trade sources for old-style car bits. Also, I could have spent ages checking out the electrics and other sources of potential problems. The garage only charged me 1.5 hours of labour (which I thought was very fair, and at a modest village-rate) plus the new rear pump and two filters, and the dreaded VAT. The front pump we thought to leave alone, as it seemed to be running OK. The rear one had been having a hard time trying to pump petrol through the gunge, and its replacement does sound a bit healthier.

    So, if you thought you had no filters and one pump, look again! It might save you a breakdown.
    Cheers
    Mike

  • #2
    Re: Petrol Filters - warning

    Makes one wonder where the muck has come from. Have you problems in the tank like others have had? I think it was the sealer that was used which was affected by petrol.
    just a thought regards Liz

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    • #3
      Re: Petrol Filters - warning

      Not necessarily relevant to more recent Marlins, but corrosion or degradation of the fuel tank and its seals may be down to increased levels of Ethanol in fuel.
      The permitted level of ethanol rose from 5% to 10% this year, and it's my understanding that the suppliers have no legal requirement to publish the level of ethanol actually used.

      An article, published in the Morris Marina Owners Club magazine, is located at http://www.keepandshare.com/doc/4136...12-7-06-pm-83k

      A full description of the changes in fuels referenced above is located at http://fbhvc.co.uk/legislation-and-f...l-information/

      Comment


      • #4
        Re: Petrol Filters - warning

        My fuel problem arose after a fuel tank welding repair, the sealant they used on the sender unit disentegrated after a few weeks. The company that did the repair were surprised by this in the end the a rubber seal was used on the sender unit.
        I can only find one fuel pump and one filter on my Sierra based 2.0 DOHC.
        I replaced my old rather noisy fuel wit a Bosch 0580464070 pump 135 ltr/hr at 3bar this caused a problem as the car proceeded to cut out at around 3000rpm, I put the old pump back on and it ran perfectly.
        I still do not know if the pump was faulty or is incorrect for the Sierra 2.0 DOHC Efi engine.
        Whilst the car is out of action I should replace the old noisy pump, anyone know which pump I should obtain ?, mine is 12mm inlet & 8mm outlet hose fitting.
        Regards
        Dave

        Comment


        • #5
          Re: Petrol Filters - warning

          Hello David,

          Have a look at www.glencoe.co.uk for a range of fuel pumps, if you have an OUT of tank pump for an EFi then you will probably need OTP020. High pressure EFi run at about 5 bar with ignition on and 46p.s.i.when engine running, so nothing less than a 5 bar. Obviously a carb set up will be lower.
          Phil
          Last edited by philcoyle; 10-08-13, 08:26 PM.

          Comment


          • #6
            Re: Petrol Filters - warning

            Tanks Phil
            The Haynes manual is not helpful regarding specification of fuel pump, the vast array of fuel pumps available was confusing me.
            Mine is an out of tank fuel pump, the company I bought Bosch pump from said it was suitable back to them to try for a refund.
            Unfortunately I am unable to find any information on the old pump.
            Regards
            Dave

            Comment


            • #7
              Re: Petrol Filters - warning

              Hi Dave
              Does it have a banjo fitting on the outlet and a 12mm inlet. The Ford number I have from my old pump is 86 BB 9350 AA.
              The other number is a Bosch number 0 580 464 034 this cross references with the OTP020 in the glencoe catalogue.
              I have a Ford focus intank pump on mine I did away with the old pump prefering the quiteness of the intank, but that is a whole new story.
              Phil

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              • #8
                Re: Petrol Filters - warning

                Hi Phil
                Mine is straight hose & clip 12mm inlet & 8mm outlet, I have found a Sytec OTP020 like this. No desire to convert to intank enough to do with other jobs on the car.
                Thanks
                Dave

                Comment


                • #9
                  Re: Petrol Filters - warning

                  My Roadster has Dellorto carbs with integral plastic (Nylon?) mesh filters incorporated into the banjo fuel fittings. I found that the mesh had completely swollen and effectively blocked the filters. I realise that the engine is much older than the Ford DOHC but I reckon this problem is caused by the increased level of ethanol attacking the plastic. Something to be aware of, particularly with older engines.
                  Geoff

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                  • #10
                    Re: Petrol Filters - warning

                    Terry at Sytec (Glencoe) recommended the TCP0201 (=FP604) for my BMW 2.5, and emphasised it should have a 12mm feed.

                    He also suggested making sure the wiring is 20amp rated, with a 15 amp fuse. He has found a lot of problems occur when lower ampage cable is used. As it gets hot the resistance changes so the voltage reduces.

                    For each 1 volt drop there is around a 20% reduction in the pumped volume output.

                    So, might be an idea to check the wiring as well as the filters?

                    Comment


                    • #11
                      Re: Petrol Filters - warning

                      Guys
                      You may well be right about the lack of cleanliness of the fuel tank, as the car is 15 years old. I also suspect that the 2 filters had never been changed in its entire life. The original owner was female, who did not get Marlin to supply a space-saver spare wheel in the dummy cover on the boot-lid, nor did she buy a jack & wheel-brace. It was a very expensive factory-built car in 1998, and to save the odd £100 was a strange economy.

                      Soon after I bought it 4 years ago, in an exchange of e-mails with me, she said she relied on the AA to sort out punctures! Not much consolation on the road-side with a damaged wheel and nothing handy to replace it!

                      What's this got to do with filter maintenance you might ask? Nothing - except to illustrate that perhaps the car did not get much attention in the 1st 9,000 miles and 11 years with the original owner. Also, I blame myself for not searching out the 2 hidden filters. Now I know, I might do a regular change of them. Ideally, I wish there was an in-line filter fitted with a glass bowl to readily demonstrate the amount of crap collected. I don't think the cheapo plastic ones would serve this purpose. Has anyone got any suggestions in this area?

                      Cheers
                      Mike

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