Shuddering and cutting out when under 1/2 tank!

Carbs; K-jet; Tanks; Lines; Filler necks, Senders; aftermarket fuel systems; Exhausts and Manifolds;air filters - standard and aftermarket

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Sammo
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Joined: Sat Aug 18, 2018 8:30 am
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Shuddering and cutting out when under 1/2 tank!

Post by Sammo » Sun Aug 19, 2018 4:03 pm

Afternoon,

My first post here and it's a question. I'm looking to buy my first Scirocco but the one I'm looking at has been sat for a few years and only recently back up and running with MOT etc. The guy has told me that when the fuel gets below 1/2 tank the car will struggle to run and then cut out. Above 1/2 tank and it's fine. Any ideas what might be causing this? The car is cheap enough that I can spend some money sorting this fault but I don't want to open a can of worms with it!

Cheers,

Sammo



BlackGTX
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Re: Shuddering and cutting out when under 1/2 tank!

Post by BlackGTX » Mon Aug 20, 2018 6:37 am

Possibly holes in the filler neck so the tank is at a lower pressure than normal



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essextom
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Joined: Sat Feb 18, 2012 7:27 pm
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Location: Chelmsford

Re: Shuddering and cutting out when under 1/2 tank!

Post by essextom » Mon Aug 20, 2018 8:55 am

Sammo wrote:
Sun Aug 19, 2018 4:03 pm
Afternoon,

My first post here and it's a question. I'm looking to buy my first Scirocco but the one I'm looking at has been sat for a few years and only recently back up and running with MOT etc. The guy has told me that when the fuel gets below 1/2 tank the car will struggle to run and then cut out. Above 1/2 tank and it's fine. Any ideas what might be causing this? The car is cheap enough that I can spend some money sorting this fault but I don't want to open a can of worms with it!

Cheers,

Sammo
Id say its more likely to be the fuel sender/ pick up in the tank that has a crack/leak so when fuel falls below it only sucks air in.



mr.brown
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Location: Surrey

Re: Shuddering and cutting out when under 1/2 tank!

Post by mr.brown » Mon Aug 20, 2018 11:41 am

Each answer above is valid - depending on whether the car in question is injection or carburettor. What year/model/engine is it?



mark1gls
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Location: Somerset

Re: Shuddering and cutting out when under 1/2 tank!

Post by mark1gls » Mon Aug 20, 2018 11:03 pm

^^^^ what Mr Brown said... a little more info will help as the cars do differ from what year it is and type of fuel intake the engine has.


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
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Eagle1
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Location: Devon

Re: Shuddering and cutting out when under 1/2 tank!

Post by Eagle1 » Tue Aug 28, 2018 5:38 pm

When I got mine I dropped the rear axle, gives you a chance to do all the brake pipes, put the flexy ones on first. I also cleaned the underside of the car and waxoyled it. Painted everything in sight and renewed everything as well. Most importantly the tank came out and I now possess what I call "Dip", (see Roger Rabbit if you're not sure), or time expired fuel. All the fuel lines were replaced along with a new filter.