Series 3 Petrol - air in fuel line

Chrisandtaba · May 27, 2020

Help - my landy starts an runs okay but after about 5 minutes i get air bubbles in the fuel line and it breaks down. I recently replaced the fuel pump and that's when the problems started. Have tried PTFE tape on union but no difference and have tried sleeving section of nylon pipe from chassis member mount to pump an again no luck. Please help i am desperate!

blue beasty · May 27, 2020

You most likely have a leak between the tank and pump. Because it's under negative pressure as the pump 'sucks' fuel leakage is minimal but air can be pulled in.

Inspect from pickup pipe all along fuel line or replace

wireman · May 27, 2020

How much fuel is in the tank? It is not unknown for the fuel pick up pipe in the tank to corrode and draw air in when the fuel level drops below the hole.

Colthebrummie · May 27, 2020

You did attach the new pump correctly didn't you, it possible to get the operating lever the wrong side of the cam.

Col

wireman · May 30, 2020

Chrisandtaba said:
Help - my landy starts an runs okay but after about 5 minutes i get air bubbles in the fuel line and it breaks down. I recently replaced the fuel pump and that's when the problems started. Have tried PTFE tape on union but no difference and have tried sleeving section of nylon pipe from chassis member mount to pump an again no luck. Please help i am desperate!

Did you get to the bottom of this?

Chrisandtaba · Jun 4, 2020

So new fuel pump arrived today and when i came to fit if i noticed the cast flange clashed with a bolt head so wasn't seating properly! Had to file it down to make it fit which makes me think the other one wasnt fitted properly either. I also found 3 gaskets when i took it off that someone else had fitted. Could explain the low flow rate but not sure about the bubbles. Battery flat now so can't check it . Was a britpart pump and now i have two!

Chrisandtaba · Jun 4, 2020

wireman said:
How much fuel is in the tank? It is not unknown for the fuel pick up pipe in the tank to corrode and draw air in when the fuel level drops below the hole.

Full tank tried that one

Chrisandtaba · Jun 4, 2020

Colthebrummie said:
You did attach the new pump correctly didn't you, it possible to get the operating lever the wrong side of the cam.

Col

Not sure how to attach incorrectly as cannot see. Fitted from the top and hooked top of follow in and then rotated downwards

rob1miles · Jun 4, 2020

Does it have a glass bowl?

Chrisandtaba · Jun 5, 2020

Yes it does. Have started and run it 4 times now and seems to be okay. Fingers crossed this has sorted the issue. Will keep you posted. Thanks everyone for your help and advice

Series 3 Petrol - air in fuel line

Chrisandtaba

Member

blue beasty

Leaks an prone to bits dropping off

wireman

Well-Known Member

Colthebrummie

Well-Known Member

wireman

Well-Known Member

Chrisandtaba

Member

Chrisandtaba

Member

Chrisandtaba

Member

rob1miles

Well-Known Member

Chrisandtaba

Member

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