Ignition switch and fuel pump

[Microbusdeluxe]

First off I have a Bostig conversion so some of my wiring is different from when it was a waterboxer, but I wonder if anyone knows the answer to this.

I have a crank no fire situation. I've narrowed it down to the fact that the fuel pump is not getting power. Does anyone know for a fact if a bum ignition switch prevents power from passing to the fuel pump?

Like I said the engine cranks nice and fast. There is a good spark, in fact it will start when I spray starter fluid down the air intake. The problem is that I can't get any volts when I try to measure current at the fuel pump. I've grounded it on the pump and the chassis, so grounds are not the issue. I've taken off the outlet hose on the pump and no fuel is being expelled by it. I even put in my new spare pump, still no luck.

I'm going to try a new switch tomorrow but figured I'd ask here first. Thanks.
_________________
'69 Squareback RIP
'65 21 window deluxe sold before the price spike, damn it.
'70 rhd bay now a taxi in South Sudan
'81 Westy sold
'89 hightop Westy Joker syncro 16" now with Bostig!

[16CVs]

I doubt it's a switch. If the switch were bad you would not have spark. I think I would contact Bostig and find out where the FP relay or fuse is.

Stacy
_________________
1987 Syncro Westfalia Triple knob (bastard)
1989 Syncro Tristar Triple knob "Swedish"
2013 Jetta Hybrid a true "Zwitter"
Samba member # 14980
Call anytime number 650 722 4914 .
Keep Your van running and upkept tastefully for the love of the hobby.
Don't let your van end up in an "abortions" thread.

[Wildthings]

I have no clue what the person who did your conversion did for a Fuel Pump relay. Maybe he used the stock VW setup or maybe he did something else? If you know who did the conversion now would be a good time to give them a call. A non running fuel pump could also be a problem with the ECU but that is not very likely.

[VicVan]

Try supplying your fuel pump directly with 12V. Use a fused wire running from the battery to the Positive side of fuel pump, listen if it hums, and start your engine. This will rule out the pump itself, and you'll be ceratin it's a power supply issue only.
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'90 Little Blue Truck, 2WD auto, FAS GenV 2.0 NA (AVH)

[Microbusdeluxe]

Thanks for the input. I'm the guy who did the conversion, following the Bostig method and putting 30,000 miles on it with very little trouble.

There is a relay that controls the fuel pump. I've put in a new one but no change. I can get the pump to run by wiring it directly to power, so pump and wires feeding it are good.

I am also skeptical that it is the ignition switch as the starter motor engages and it actually starts if I spray starter fluid down its throat, so I have ignition. But every other poster seems to jump to that so I wanted to see if someone could give me a definite reason why the switch would work for the starter motor and ignition but not the fuel system.

I am in contact with Jim at Bostig, a great guy who does free follow-up for all his customers for years. I'll post here what the solution turns out to be.
_________________
'69 Squareback RIP
'65 21 window deluxe sold before the price spike, damn it.
'70 rhd bay now a taxi in South Sudan
'81 Westy sold
'89 hightop Westy Joker syncro 16" now with Bostig!

[VicVan]

[16CVs]

So as mentioned check for power. One of those leads is a Neg input from the ECU. Once you find it, you can ground it and confirm that the relay is powering up and trace that wire color back to the ECU, most likely you have an Open or Broken wire.
_________________
1987 Syncro Westfalia Triple knob (bastard)
1989 Syncro Tristar Triple knob "Swedish"
2013 Jetta Hybrid a true "Zwitter"
Samba member # 14980
Call anytime number 650 722 4914 .
Keep Your van running and upkept tastefully for the love of the hobby.
Don't let your van end up in an "abortions" thread.

[Vanagon Nut]

[Microbusdeluxe]

Thank you so much for the diagram (I'd looked at the Bentley but didn't understand the picture). It does indeed seem like the ECU is failing to pull the relay to ground, so you may have solved it. I'm going to try something along this line that Bostig Jim suggested tomorrow and will let you know if it works.
_________________
'69 Squareback RIP
'65 21 window deluxe sold before the price spike, damn it.
'70 rhd bay now a taxi in South Sudan
'81 Westy sold
'89 hightop Westy Joker syncro 16" now with Bostig!