[T3] Fuel Pump Relay - 69 Fastback

William Jahn willjahn975 at gmail.com
Fri Jul 9 21:13:59 PDT 2021


No problem . If you find you need a relay this one would work just fine.
https://www.autozone.com/electrical-and-lighting/relay-and-resistors/p/novita-40-amp-spdt-accessory-replay/849395_0_0.


 Wouldn't hurt to have a spare and it has all you need and can be mounted
easy. Still I feel it's that one wire.

On Fri, Jul 9, 2021 at 9:07 PM Tim Schiller <schillertim at comcast.net> wrote:

> It’s hard not to run out right now and check all those, but will early
> tomorrow morning. Thx for some direction
>
> Sent from my iPhone
>
> > On Jul 9, 2021, at 8:58 PM, William Jahn <willjahn975 at gmail.com> wrote:
> >
> > Last thought , if you find there is an issue with the power relay I
> think
> > Jim may have some good used ones or just a 30 amp Bosch relay wired the
> > same way will work , they all work the same way. It's just the amperage
> > that differs.
> >
> >> On Fri, Jul 9, 2021 at 8:52 PM William Jahn <willjahn975 at gmail.com>
> wrote:
> >>
> >> From what you said I doubt if the pump relay is the issue. I bet you
> find
> >> that red /black wire at the battery is either loose or corroded or the
> >> eyelet on the end of that wire is not making good contact to that wire.
> If
> >> it's not there check the spade connector on the power relay. It has to
> be a
> >> good connection at both ends. If it is that red/black I would still make
> >> sure the power relay spade connectors are all sound and fit snug . I
> went
> >> through mine a while back and found the brown ground screw was fine yet
> the
> >> spade connector only had one rolled edge . It worked I was just checking
> >> and happened to find it. So I checked them all . it's even possible the
> >> power relay contacts have high resistance yet they don't have that much
> >> current to burn them. Mine is the original on my 73 I decided to just
> check
> >> for voltage drop and found there was some so I removed the relay cover
> and
> >> cleaned the contacts. This is my only car and the last thing I want is
> to
> >> be sitting somewhere stranded.
> >>
> >>> On Fri, Jul 9, 2021 at 8:34 PM William Jahn <willjahn975 at gmail.com>
> wrote:
> >>>
> >>> On the positive battery post there is one red/black wire that runs
> across
> >>> from the battery pos to 30/51 on the power relay . That wire is
> fastened to
> >>> the pos battery clamp  bolt by an eyelet then the battery clamp nut .
> This
> >>> wire is the only power to the power relay . Check that to make certain
> it
> >>> has a good connection to the battery . If there is a voltage loss
> there you
> >>> will not get 12 volts at the pump relay . All it takes is it being
> loose or
> >>> corroded . It runs all the way from the battery to the power relay.
> That
> >>> may explain why it works then doesn't. That is the contact part of the
> >>> relay that sends power to 85 on the pump relay. If it's loose or
> corroded
> >>> all it takes is to try to start the car and you get an arc which might
> be
> >>> just enough for it to make enough contact to run the pump . I would
> check
> >>> that before going any further. If there is going to be a bad connection
> >>> either it's loose and you know how battery cables get corroded . It's
> >>> simple to check and rule it out . It runs near the top inside of the
> wall
> >>> held by small tabs . You will be able to see it easy.
> >>>
> >>> On Fri, Jul 9, 2021 at 8:01 PM Tim Schiller <schillertim at comcast.net>
> >>> wrote:
> >>>
> >>>> Replaced fuse with 8 amp just in case it was bad. Bentley manual shows
> >>>> most fuses are 8 amp except 9 & 11 are 16 amp. Appears several mine
> are 16
> >>>> when they should be 8. Separate issue.
> >>>>
> >>>> I hear the 2 clicks, both the fuel pump relay a main power relay when
> >>>> key is turned on.
> >>>>
> >>>> I tested pump again with a direct power source and it buzzes. Car
> >>>> actually started a ran for a while after immediately hooking relay
> back up.
> >>>> However, when I turned it off it would not start again. When car was
> >>>> started, the 87 pin was reading 12V
> >>>>
> >>>> Back to testing the fuel pump relay. The voltage to pin 87 is not
> >>>> consistent. Turning key I sometimes get a zero reading, sometimes a
> 5-6V
> >>>> reading and sometimes a 2-3 V reading. I tested when the pump wire
> was not
> >>>> attached trying to eliminate the ground wire to the pump as a possible
> >>>> issue. Not really sure how anyone can follow that brown wire between
> relay
> >>>> and pump.
> >>>>
> >>>> I found some help to turn key so I could hold on to pump. There is a
> >>>> little bit of a buzz when the key is turned on, but didn’t seem that
> >>>> strong. It feels like it is priming or buzzing for 1-2 seconds when
> the key
> >>>> is then turned off. Seems just opposite of what it should be doing
> >>>>
> >>>> Currently trying to find something on Samba forum for a similar
> problem.
> >>>> I really struggle with the search function on Samba
> >>>>
> >>>>
> >>>> Sent from my iPhone
> >>>>
> >>>>> On Jul 9, 2021, at 12:39 PM, Jim Adney <jadney at vwtype3.org> wrote:
> >>>>>
> >>>>> On 9 Jul 2021 at 10:48, Tim Schiller wrote:
> >>>>>
> >>>>>> I will follow the ground and check the fuse
> >>>>>>
> >>>>>> I did hook a reliable 12V to the red wire going to pump. Pump buzzes
> >>>> loud
> >>>>>> and clear.
> >>>>>>
> >>>>>> I had purchased 2 relays and swapped just in case one was bad, but
> >>>> same
> >>>>>> results
> >>>>>
> >>>>> One other quick check you can easily do if the car is in a quiet
> >>>> place, is to
> >>>>> listen when you turn the key ON. You should hear a relay click when
> >>>> the key
> >>>>> goes ON and a second relay click about 1 second later.
> >>>>>
> >>>>> If you have questions about whether this is happening correctly, look
> >>>> under
> >>>>> the back seat, on the  driver's side. Mounted on the top rail, there
> >>>> will be 2
> >>>>> relays, each mounted with a single screw. One of them has a ground
> >>>> wire
> >>>>> under that screw head. Make SURE that screw is tight. That's the
> >>>> ground for
> >>>>> the main power relay coil.
> >>>>>
> >>>>> --
> >>>>> *******************************
> >>>>> Jim Adney, jadney at vwtype3.org
> >>>>> Madison, Wisconsin, USA
> >>>>> *******************************
> >>>>>
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