General Information > Troubleshooting

Bubbles in the fuel line!

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Cman:
On my 94 td jetta I've got bubbles coming the filter in the fuel line,, I checked all the hose clamps on the filter and they seem fine..

where are there any other conections that I can check??

Also does this car have an electric fuel pump in the tank like the older gas models??

Thanks Again.

andy2:
The injection pump pulls the fuel from the tank through the filter there is no electric pump.If there is a leak in the system it will pull air in beacuse its under vaccum, a restricted fuel filter can also be the problem.Usually the problem is the plastic return fitting on top of the filter they can get cracked  or the o-ring uesd to seal it can also be not sealing well too.If you change the fuel filter be sure to lub the o-ring so that it will seal well.Air could also be coming out of the injectors return or inj pump as there could be a leaking seal on the pump or an injector problem.just look at the inj pump and verify that its dry and no fuel is leaking from it and then i would try a fuel filter. Always fill the new filter with fuel, then drive the car around for 10min to get any other air out of the system after the filter is changed. hope this helps :)

mainer:
you might be lookin at the line that returns the fuel to the filter.
_________________
Mercedes 200

Cman:
no its the the supply line..  ( the larger of the 2)

I'll take a look at the oring and inspect the plastic piece as well..

Thanks

Tom

Peter:
it is perfectly OK to have small  bubbles in the system ...only if the bubbles  get large should you be concerned ..(maybe a new filter is needed)..you will notice problems  if your car starts missing...it never hurts to check for rusty fuel clamps along the whole line to ensure all will keep working fine...also check for rust on top of the tank were the hoses are connected too...leakage can occur there also....
--- Quote from: "Cman" ---On my 94 td jetta I've got bubbles coming the filter in the fuel line,, I checked all the hose clamps on the filter and they seem fine..

where are there any other conections that I can check??

Also does this car have an electric fuel pump in the tank like the older gas models??

Thanks Again.
--- End quote ---

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