Fuel System issues

[RSD]

1973 Opel GT- The car idles (700RPM) and runs initially at low RPM perfectly, however, once one the open road may be a ½ mile it starts to chug, and then chug a bit more, then shuts down. If the car sits for just a couple of minutes the process starts all over again. The carb was professionally rebuilt, the fuel lines replaced, tank lines vent ect. replaced, new fuel pump, new fuel filters (one at the carb and one by the tank). I have not yet removed the filter within the tank assuming it is still there but the clear filter by the tank is always ½ full of gas. As you can imagine this is frustrating because by the time I can look to trace the fuel shortage (assuming that is the issue) the lines appear to be full.
Thoughts would be very much appreciated. Thanks

[neuropel]

Sounds like you need to remove that fuel "sock" filter that's inside the tank. Do a search here and you'll find all kinds of information on how to effectively remove it.

[RSD]

Thank You. I read a number of the postings which contained a lot of great information. I pulled the gas line from the bottom of the tank and gas flowed steady and full stream. However, when I pulled the line from the fuel pump it just dripped (after I reconnected the line to the tank). Should the gravity feed take the gas all the way to the pump in a free flow? If so I may have a kinked line because they are new.

[BQS4]

Originally Posted by RSD Thank You. I read a number of the postings which contained a lot of great information. I pulled the gas line from the bottom of the tank and gas flowed steady and full stream. However, when I pulled the line from the fuel pump it just dripped (after I reconnected the line to the tank). Should the gravity feed take the gas all the way to the pump in a free flow? If so I may have a kinked line because they are new.

You have to remember, that if you're using the stock solex, or a 32/36 weber with the stock mechanical fuel pump, it's only like about 3-4PSI from the pump to the carb, it really doesn't "draw" fuel like an electric pump. So any obstruction, not matter how little, from the tank to the pump, is going to cause problems.

[RSD]

It has the stock carb etc... So should I see a steady stream of fuel if I pull the line from the intake side of stock fuel pump. Thanks again

[tomking]

Originally Posted by RSD It has the stock carb etc... So should I see a steady stream of fuel if I pull the line from the intake side of stock fuel pump. Thanks again

Yes if it is held beneath the level of fuel in the fuel tank. If it is held higher, no.

[myopels]

Originally Posted by RSD 1973 Opel GT- The car idles (700RPM) and runs initially at low RPM perfectly, however, once one the open road may be a ½ mile it starts to chug, and then chug a bit more, then shuts down. If the car sits for just a couple of minutes the process starts all over again. The carb was professionally rebuilt, the fuel lines replaced, tank lines vent ect. replaced, new fuel pump, new fuel filters (one at the carb and one by the tank). I have not yet removed the filter within the tank assuming it is still there but the clear filter by the tank is always ½ full of gas. As you can imagine this is frustrating because by the time I can look to trace the fuel shortage (assuming that is the issue) the lines appear to be full. Thoughts would be very much appreciated. Thanks

RSD, you might want to double check the line coming out of your tank. I had part of the filler cap break off and fall into the tank. There is no filter on the inside of my tank, and I could drive down the roud until the piece got sucked down over the opening. The motor would starve and die, and after a couple of seconds of not running, the vacumn would release the piece. The car started abd ran until the next cycle all over again-infuriating and unsafe!

[markandson]

If your tank is all the way full then it is also possible that you have plugged vent lines, (inside the car all the way back above the tank). A full tank leaves very little air inside the tank and you could quickly pull a vacuum if there is no way for air to get in. There is also a line that comes out of the tank and runs forward to the charcoal canister, if this line is plugged or capped off it would produce the same problem. BTW the vent lines are connected to nipples on the tank that have 1/16" orifices inside them, so the lines may all look good but the system could still be plugged off.

[RSD]

Well I took your advice and pulled the tank, cleaned the tank, cleaned the fittings going to the tank and removed the sock. It appears to be running better but I’ll have to take it on the open road to be sure.
One more question:
Where is the charcoal canister located?

[BQS4]

Originally Posted by RSD Where is the charcoal canister located?

If this is a GT, it's up in the nose, across from the battery, on the driver's side.

[kwilford]

Moderator Note: The posts related to the sender wire were split off to
http://www.opelgt.com/forums/1e-othe...tml#post204434