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General Information => General => Topic started by: 8v-of-fury on April 18, 2010, 10:54:31 am

Title: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 18, 2010, 10:54:31 am
Bad news: Shorted out the lead for the fuel shutoff on the pump...

Good news: the solenoid still clicks when 12v is applied to it.

Had the key on with music playing while I was minorly tweaking the fuel screw a touch... Wrench touched the soenoid.. crap. Checked the fuses, yet all them are fine. What gives power to the solenoid? I mean if worst comes to worst, I;ll just tap in to the radio key-on source.

Man it billows like a cummins with just half a turn in. Don't worry though it was merely for a fun ride around the block.. not keeping it. ;) untill I get the intake and exhaust setup. :)
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: rabbitman on April 18, 2010, 01:54:36 pm
That solenoid isn't fused, rather lame.

Did you fry the wire or is it still lookin' good? I did that a few years ago, I had a splice in the wire and it was touching ground 'cause I'd forgotten to tape it. So I got in let the GP's glow and cranked it up :(, it didn't start since all the juice was going straight to ground.
The wire was smoking and stuff, kinda melted some other wires it was touching but they weren't toooooo bad.

If all you did was spark it I'd say it's fine, that's not enough time to melt stuff........it's probably hard on the ignition switch though with all those amps running through it.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: Vincent Waldon on April 18, 2010, 02:32:06 pm
Yup.... no fuse on that wire... so chances are it's let go somewhere upstream. IIRC it's run off the glow plug relay on a lot of chassis.

The good news is that it's just a "power when the key is on or start" line, so pretty easy to run another line from something.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 18, 2010, 03:27:53 pm
it sparked it was a momentary touch of the wrench. Line shows no voltage. ;(

Title: Re: Shorted out the lead for the fuel solenoid.
Post by: burn_your_money on April 18, 2010, 06:29:56 pm
Pretty sure it's powered from the GP relay.

Sadly it's not that easy to just wire up to the stereo wire because you won't have power while cranking, and well you know.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 18, 2010, 06:36:38 pm
CRAP. Well toggle switch run it is ;)

that will make it easy to leave the car running if i need to leave it running without being there eh?

what wire is it? how can i fix it properly?
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: burn_your_money on April 18, 2010, 06:40:12 pm
swap GP relays from one of the other cars in the fleet and see what happens.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 18, 2010, 06:40:55 pm
oh really? all other cars are gassers.. do you figure i burnt out my GP relay?!?
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: burn_your_money on April 18, 2010, 06:41:51 pm
Ok, come by the shop and buy some fuel hose to fix your leak and I'll give you a relay. How's that sound?

You may have burnt out part of the relay. Everytime I've shorted the stop solenoid out I was lucky/quick enough to not cause any serious problems.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 18, 2010, 07:36:13 pm
Tyler, you tell me this when I spent the whole weekend in Stoufville.. and am now back up north! lol!
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: burn_your_money on April 18, 2010, 07:38:39 pm
It's not my fault you posted this today :P

You know though, I only have fast GP relays. So I don't think I could be of any help anyways.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 18, 2010, 07:40:14 pm
well i have them pimped. so i dont need it anyway. I will just wire a switch in for now.. its not a big deal.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: lovinthedeez on April 19, 2010, 05:38:43 am
On my diesel conversion, I ran a wire tapped from the ignition switch that had power while cranking and on.   no switch needed, and nothing really gets modified other than adding one wire.   ;D
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: Vincent Waldon on April 19, 2010, 07:58:14 am
On my diesel conversion, I ran a wire tapped from the ignition switch that had power while cranking and on.   no switch needed, and nothing really gets modified other than adding one wire.   ;D

Yup, there should be lots of circuits with that criterion to tap into.  The ones to avoid are the ones driven off the load-reduction relay, since they're specifically un-powered when the starter is engaged to free up extra amps.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: theman53 on April 19, 2010, 08:13:14 am
would adding an inline fuse be a bad idea? If not what would you put in there Vince?
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: Vincent Waldon on April 19, 2010, 09:16:46 am
In my mind if it shorts it's because the stop solenoid has failed internally....unless some grease-monkey is in there with a wrench at the time.  ;) ;D    If it fails internally it's gonna snap closed most likely, fuse or none.

The purpose of the fuse is to protect the wiring back to the battery... 14ga can handle at least 20A-ish so I'd use a 10-15A fuse... just off the top of my head.  To Andrew's point, you want something hefty enough that it won't weaken over time and then fade in the middle of some train tracks somewhere.

I should dig up my MK3 schematics and see if the revised version of the glowplug system they use is fused.  I believe it is on TDIs.... but will confirm.
Title: Re: Shorted out the lead for the fuel solenoid.
Post by: 8v-of-fury on April 19, 2010, 11:07:01 am
So tapping in to a circuit underneath the dash should be a no brainier eh? How many come from the ignition for power while cranking? I would assume just one or two.. one for stop solenoid, one for the 50pin on the starter eh?

I will see what I can't figure out, does the Haynes manual cover what lines are hot while cranking??

Yes I know, I know. I do not have a Bentley.. If I did, i wouldn't need you guys ;) amazing though, for people who swear by it.. I have done four, almost five years with an Mk1 and no real issues. lol Now I have three mk1's and an mk2 to look after. :D