Missing/Jumped Relays on Carb Conversion? Options

[RBR53]

I’ve got this ‘75 1.8 that has been converted to dual Webers. Most of the relays have been yanked and a couple of them had jumpers installed in their place. Part of me thinks this is a pretty Mickey Mouse way to do it, the other part knows that converting to a carb may render some relays redundant or worse, they may disable the things like the fuel pump from turning on if they fail to get the signal they’re designed for. Not knowing much about the 914 world yet, I figured I’d ask the experts. Is this pretty much the way it’s done, or is it tomfoolery?

Dan

[SirAndy]

Oh, that hurts my eyes. Looks like someone just put a jumper to constantly run the power relay and fuel pump relay.
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This would be a better solution:
http://www.914world.com/specs/SirAndyCarbFuelPumpRelay.php
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[SirAndy]

Relay board diagram:
http://www.914world.com/bbs2/index.php?s=&...t&p=3036193
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[RBR53]

Oh, that hurts my eyes. Looks like someone just put a jumper to constantly run the power relay and fuel pump relay.
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This would be a better solution:
http://www.914world.com/specs/SirAndyCarbFuelPumpRelay.php
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You’re the man! Thanks, I’ll get on it.

Dan

[RBR53]

How’s that for easy? I had the relays in a box in the trunk, so I threw them in, added the ground wire as recommended, and all seems well!

Thanks again!

Dan

[porschetub]

How’s that for easy? I had the relays in a box in the trunk, so I threw them in, added the ground wire as recommended, and all seems well!

Thanks again!

Dan

Easy fix for crappy bodge up ,well done ,cheers.

[wonkipop]

I’ve got this ‘75 1.8 that has been converted to dual Webers. Most of the relays have been yanked and a couple of them had jumpers installed in their place. Part of me thinks this is a pretty Mickey Mouse way to do it, the other part knows that converting to a carb may render some relays redundant or worse, they may disable the things like the fuel pump from turning on if they fail to get the signal they’re designed for. Not knowing much about the 914 world yet, I figured I’d ask the experts. Is this pretty much the way it’s done, or is it tomfoolery?

Dan

1.8s don't have all the relays there nor use them all like a D jet.
just the one relay for the heater fan which is there.
one is vacant anyway on all cars unless they had heated rear window.

1.8 fuel pump runs off a dual relay under the battery tray.
so no one pulled them. they were never there.

however it does look like they have done something to run the fuel pump as sir andy notes. you'd have to do something i guess. dual relay works with the AFM unit on the 1.8. which would have been ditched to go to carbs. 1,8s had the safety feature where fuel pump switched off if engine was not running. dual relay activated fuel pump when starting (cranking) and handed off to AFM when engine fired and AFM signalled to run the pump.

[RBR53]

I’ve got this ‘75 1.8 that has been converted to dual Webers. Most of the relays have been yanked and a couple of them had jumpers installed in their place. Part of me thinks this is a pretty Mickey Mouse way to do it, the other part knows that converting to a carb may render some relays redundant or worse, they may disable the things like the fuel pump from turning on if they fail to get the signal they’re designed for. Not knowing much about the 914 world yet, I figured I’d ask the experts. Is this pretty much the way it’s done, or is it tomfoolery?

Dan

1.8s don't have all the relays there nor use them all like a D jet.
just the one relay for the heater fan which is there.
one is vacant anyway on all cars unless they had heated rear window.

1.8 fuel pump runs off a dual relay under the battery tray.
so no one pulled them. they were never there.

however it does look like they have done something to run the fuel pump as sir andy notes. you'd have to do something i guess. dual relay works with the AFM unit on the 1.8. which would have been ditched to go to carbs. 1,8s had the safety feature where fuel pump switched off if engine was not running. dual relay activated fuel pump when starting (cranking) and handed off to AFM when engine fired and AFM signalled to run the pump.

Useful information. I have experience working with the L jets via the VWs of the late ‘70s and what you’ve described is familiar to me, I imagine they even use the exact same double relay you’ve mentioned. I’ll look into it further, but I will say that everything’s working as it should at the moment and I prefer the relays to the jumper wires. Not sure if it’s there’s any reason not to leave it this way?

Dan

[wonkipop]

I’ve got this ‘75 1.8 that has been converted to dual Webers. Most of the relays have been yanked and a couple of them had jumpers installed in their place. Part of me thinks this is a pretty Mickey Mouse way to do it, the other part knows that converting to a carb may render some relays redundant or worse, they may disable the things like the fuel pump from turning on if they fail to get the signal they’re designed for. Not knowing much about the 914 world yet, I figured I’d ask the experts. Is this pretty much the way it’s done, or is it tomfoolery?

Dan

1.8s don't have all the relays there nor use them all like a D jet.
just the one relay for the heater fan which is there.
one is vacant anyway on all cars unless they had heated rear window.

1.8 fuel pump runs off a dual relay under the battery tray.
so no one pulled them. they were never there.

however it does look like they have done something to run the fuel pump as sir andy notes. you'd have to do something i guess. dual relay works with the AFM unit on the 1.8. which would have been ditched to go to carbs. 1,8s had the safety feature where fuel pump switched off if engine was not running. dual relay activated fuel pump when starting (cranking) and handed off to AFM when engine fired and AFM signalled to run the pump.

Useful information. I have experience working with the L jets via the VWs of the late ‘70s and what you’ve described is familiar to me, I imagine they even use the exact same double relay you’ve mentioned. I’ll look into it further, but I will say that everything’s working as it should at the moment and I prefer the relays to the jumper wires. Not sure if it’s there’s any reason not to leave it this way?

Dan

yes - i'd leave it the way you now have it.

maybe there is some way to make the fuel pump behave as it does on the Ljets where it switches off but i would not know how. my L jet is stock and still fuel injected.
i think the set up you now have with the link Sir Andy provided lets you run it as per a D jet car where pump is on when ignition is on and via relays. its as good as anything when running the carbs.

and yes. all the components on the 1.8 L jet are shared with VW exactly.
with the 412 at first. and later with the L jet beetles. a few shared bits with the beetle including double relay and the fuel injectors.

[SirAndy]

1.8s don't have all the relays there nor use them all like a D jet.
just the one relay for the heater fan which is there.
one is vacant anyway on all cars unless they had heated rear window.
1.8 fuel pump runs off a dual relay under the battery tray.
so no one pulled them. they were never there.

Good catch, i glanced over the 1.8L part because i was so horrified by the jumper wires.
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