Engine fails to start after it's been running


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frilly
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Engine fails to start after it's been running

Post by frilly » Sun Sep 15, 2019 9:54 pm

Hi all , been out for my first run in my 56 single cab, engine seamed fine untill I tried to start it straight after I stopped it! Any ideas as to why this may be? Did start again after a period of time. Kind regards neil

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8 8US
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Re: Engine fails to start after it's been running

Post by 8 8US » Mon Sep 16, 2019 6:27 am

Neil

Could be a number of things, is it a new loom or the original? If original the solution can be a hot start relay to take the load off the wiring, could simply be a dodgy solenoid, or a connection issue somewhere in the switch or the cabling.

Take a look here:-
https://www.ssvc.org.uk/phpbb/viewtopic ... 0&p=910923
Richard

1960 Single Cab Pickup “Barny” (resto thread - https://www.ssvc.org.uk/phpbb/viewtopic ... 8&t=122082)
1966 Devon “Hetty”

1980 Brasilia gone :(


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Re: Engine fails to start after it's been running

Post by frilly » Mon Sep 16, 2019 9:38 am

Hi , it's the og loom ( now running 12v) also I'm using an og switch and key . It cranks over but fails to start! Fuel pump maybe? Kind regards neil

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8 8US
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Re: Engine fails to start after it's been running

Post by 8 8US » Mon Sep 16, 2019 11:15 am

Oh sorry, thought it wouldn't turn over.

All you can do is go back to basics, fuel & spark, are they there?
Richard

1960 Single Cab Pickup “Barny” (resto thread - https://www.ssvc.org.uk/phpbb/viewtopic ... 8&t=122082)
1966 Devon “Hetty”

1980 Brasilia gone :(


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Re: Engine fails to start after it's been running

Post by frilly » Mon Sep 16, 2019 11:45 am

I'm going to need another pair of eyes to check for spark! The inline fuel filter was empty if I remember after it stopped (yes half a tank of fuel) I'm wondering dodgy fuel pump

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Re: Engine fails to start after it's been running

Post by vwJim » Mon Sep 16, 2019 2:43 pm

frilly wrote:
Sun Sep 15, 2019 9:54 pm
Hi all , been out for my first run in my 56 single cab, engine seamed fine untill I tried to start it straight after I stopped it! Any ideas as to why this may be? Did start again after a period of time. Kind regards neil
What is your starting procedure when cold and hot?
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frilly
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Re: Engine fails to start after it's been running

Post by frilly » Mon Sep 16, 2019 4:30 pm

Quick tap on throttle to engage choke when cold , just turn key when hot! Is that normal?

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Re: Engine fails to start after it's been running

Post by richandsue » Mon Sep 16, 2019 5:22 pm

try bump starting it . if it starts ok then it is a wiring problem to the starter motor. may need another pair of hands though. unless you stop on a hill. :cheers:


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Re: Engine fails to start after it's been running

Post by frilly » Mon Sep 16, 2019 6:32 pm

Fair point, it doesn't seam to turn over fast enough (battery charged and reading full) so you may be onto something with the starter!

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Re: Engine fails to start after it's been running

Post by james309 » Mon Sep 16, 2019 7:06 pm

frilly wrote:I'm going to need another pair of eyes to check for spark! The inline fuel filter was empty if I remember after it stopped (yes half a tank of fuel) I'm wondering dodgy fuel pump
Debris in tank restricting / blocking fuel supply ?

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Re: Engine fails to start after it's been running

Post by jayvanman » Tue Sep 17, 2019 6:34 pm

In my limited experience I'm inclined to say starter or battery. Even if battery is charged and reading 12v that doesn't necessarily mean the amps are there to turn the starter with enough grunt.

If you can get your hands on a battery that you know is in tip top condition I would try that 1st. Maybe another splitty owner in the neighbourhood could help out. At least then you know that will be one potential cause off your list.



If you've not changed the starter to a 12v starter and it's not turning fast enough that sounds wrong to me.

6v starter on a 12v system should be turning twice as quick so I'm inclined to think starter.

To try another battery won't cost anything so I'd start there.

Fuel.
Take the filter off and stick your finger down the choke and pull the throttle lever. If your finger gets wet and smells of fuel, then you've got fuel.

The nice thing about these engines is that they are mechanical.

You can work it out , think where the problem might be and work through a process of elimination.

Good luck.

Jason
he who sins grins


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Re: Engine fails to start after it's been running

Post by frilly » Tue Sep 17, 2019 9:44 pm

Hi Jason , I'm running a 12 v starter, starts fine from cold , run the truck for a couple of miles say then turned off . Won't start again straight after , does seem a little slow at turning over so may try your battery suggestion . Thanks for your help

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Re: Engine fails to start after it's been running

Post by DaveyMoon » Wed Sep 18, 2019 8:18 am

If its slow to crank when hot then your starter may be suffering from heat soak. I had this problem and a new starter fixed it.
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Re: Engine fails to start after it's been running

Post by tman » Fri Sep 20, 2019 5:07 pm

We had this problem with our 6v Oval Beetle. It was caused by the starter motor bush in the bellhousing expanding/binding and slowing the starter when warm. A new bush fixed it, it's supposedly a common problem.
Andrew

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Re: Engine fails to start after it's been running

Post by tman » Sun Sep 29, 2019 4:09 pm

DaveyMoon wrote:
Wed Sep 18, 2019 8:18 am
If its slow to crank when hot then your starter may be suffering from heat soak. I had this problem and a new starter fixed it.
Coincidentally, just seen this on thesamba.com: https://www.thesamba.com/vw/forum/viewt ... p?t=725848
Andrew

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