[T3] Fuel pump isn't working.
dave at hallvw.clara.co.uk
Mon Nov 1 15:40:05 PDT 2021
Could it also be an intermittent contact in the ignition/starter switch, as he says wiggling it sometimes helps?
UK VW Type 3&4 Club.
> On 1 Nov 2021, at 17:22, Jim Adney <jadney at vwtype3.org> wrote:
> On 1 Nov 2021 at 8:21, Jeff Palmer wrote:
>> Hi everyone - 69 automatic notchback parked for the winter ... it hasn´t run in about 15 years but we got it going this summer.
>> The fuel pump seems to run intermittently and if I recall I had the same issue 15 years ago but my memory is fading. The problem seems to be that sometimes the pump won´t run with the key in the `on´ position but will run when it is returned to the `off´ position. A little bit of toggling will get it to operate properly - sometimes. It seems to be accompanied by a clicking under the dash - a relay of some sort? Are these items related and if so is there an obvious solution? New relay? Cleanin grounds? New fuel pump? llof the above??
> This is a rather unusual set of symptoms, but they might be fixed in a couple
> ways. It sounds like your pump might be okay, but may need some
> "exercise" to get it back in shape. That's something that we can't fix unless
> we can get it to run more often. I have two recommendations for that.
> First, there is a grounding problem in the '68-9 cars that affects the fuel
> pump. I started making kits to fix this a few years ago. The kits are only $10
> and include some wiring and complete instructions to fix the grounding
> issue. Every '68-9 Type 3 would benefit from this.
> Second, I have two kinds of fuel pump priming switches, which can be used
> to run the pumps independent of the FI controls. The cheap kit is $10 for a
> simple pushbutton; the better kit is $30 for a 3 position (Off, Normal, (Prime))
> HD toggle switch. Both include mounting bracket, necessary wiring, and
> complete instructions.
> Yes, there is a relay under the dash that controls the fuel pump. You might
> start by listening when you turn the key ON. You should hear a relay click
> when the key comes ON and a second click ~1 second later. If you don't
> hear both clicks, the first thing to check is the relay under the back seat
> behind the driver seat. That relay should have a ground wire hooked under
> the screw that mounts the relay. Make SURE that screw is tight, so that wire
> has a good ground.
> Check those things and get back to us.
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
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