VWDiesel.net The IDI, TDI, and mTDI source.

General Information => Troubleshooting => Topic started by: dennis on January 31, 2010, 04:12:40 pm

Title: Sucking Air
Post by: dennis on January 31, 2010, 04:12:40 pm

This wonderful experience occurs with my 83 Volvo 245. I can see bubbles in the clear hose from the filter. The filter is full when I remove it. I have replaced the filter also. Has no wet spots anywhere from the tank to the filter. Dropped the tank, and the pickup is clear. I have replaced the feed hose to the filter. Pump is not leaking. Stumped.

Title: Re: Sucking Air
Post by: fatmobile on January 31, 2010, 10:11:36 pm

A vacuum gauge on the fuel line will tell you if the pump is pulling hard and bring air out of suspension.
 A full filter can  be a sign it was clogged.
 Air will often stay in a clean fuel filter, because it has a hard time pulling through the diesel-soaked paper.

Title: Re: Sucking Air
Post by: dennis on February 01, 2010, 06:47:14 am

The filter was only a couple of months old. I will drive some today and see what happens.

Title: Re: Sucking Air
Post by: dennis on February 02, 2010, 02:02:41 pm

Replaced filter housing with one from an MK1 Jetta. Problem solved 180 miles so far.

Title: Re: Sucking Air
Post by: ein bora on February 07, 2010, 06:59:36 am

I had a similar problem once with mine, after searching long and hard I found out it was the plastic fuel heater fitting on top of the fuel filter. Installed a o-ring and problem solved. That fitting is only held in place with a spring clip and I guess it wasn't exerting enough pressure on the fitting to seal the hole - hence sucking air. The older filters don't have the fuel heater.

Title: Re: Sucking Air
Post by: dennis on February 07, 2010, 03:47:52 pm

Still running like a scalded slug, but thats a good thing.