240 General: - Gas Tank Sludge? Clogging PickUp/Sender.. - Page 2

YogaBone · Nov 4th, 2015, 12:18

how very interesting-tx again

Paul240480 · Nov 4th, 2015, 12:57

Noisy main pump from 1/2 a tank full = (imo) a duff in-tank pump. The in-tank pump is just to 'lift' the fuel to the main, so that can 'send' the fuel onwards to the engine.
Once fuel level is 'low' then the main tank has to work harder to 'lift' the fuel from the depths....
I ran mine like this for some years before getting around to replacing the in-tank one. The main survived, they are strong. If my fuel is really low now the main will buzz for about a second, then goes silent.....
You can get after market pumps but be wary as some differ in size & won't fit in the sender unit correctly.
I took some pics when cumbrianmale & I did mine. & as Clifford said, watch those pipes, we busted one at the last hurdle and had to grab one in a scrappy and do the job all over again

Pics here: http://www.volvoforums.org.uk/showthread.php?t=130176

(This is assuming your B21f has the same sender set up?)

YogaBone · Nov 4th, 2015, 14:23

Thanks Paul-from what I understand Volvo issued an advisement in the early 80s that the in tank pump in the older models should be upgraded to the newer one. this is what is in mine and I think it's ok-I can hear it working (I know that doesn't mean it's working properly) but it was tested more than once and always comes up ok. I think I'll try to investigate the hoses to start and go from there, it may well be that this sender is failing. does anyone know the proper procedure for 'jumping' the sender so I can see if it's a sputter or steady stream? guessing it needs to be done with the car OFF.

YogaBone · Nov 4th, 2015, 17:13

Quote:

Originally Posted by cp1790

Recently changed all my fuel side the tank, fuel pump and fuel filter as mine kept dying on me and chugging really bad on tickover and nothing has changed other than the fuel gauge has decided it doesn't want to work anymore! now starting to think it could be an air leak or the bit your referring to Derek is that the bit of pipe on the fuel sender unit?

CP1790 - you probably already know this, but in regards to the gauge not working any more, the copper looking regulator behind the temp and gas gauges is a finicky one.. you might try replacing it once u get the in tank sorted if its still not working. took me 3 of them to find a good one.. also took a few tanks of fuel to set it straight. Is it working but showing 1/4 tank lower than the truth? or is it lodged in a static position?

Nov 4th, 2015, 12:57	#12
Paul240480 Ovlovnut Last Online: Feb 25th, 2024 08:58 Join Date: May 2006 Location: Nivillac View Photos By: Paul240480	Noisy main pump from 1/2 a tank full = (imo) a duff in-tank pump. The in-tank pump is just to 'lift' the fuel to the main, so that can 'send' the fuel onwards to the engine. Once fuel level is 'low' then the main tank has to work harder to 'lift' the fuel from the depths.... I ran mine like this for some years before getting around to replacing the in-tank one. The main survived, they are strong. If my fuel is really low now the main will buzz for about a second, then goes silent..... You can get after market pumps but be wary as some differ in size & won't fit in the sender unit correctly. I took some pics when cumbrianmale & I did mine. & as Clifford said, watch those pipes, we busted one at the last hurdle and had to grab one in a scrappy and do the job all over again Pics here: http://www.volvoforums.org.uk/showthread.php?t=130176 (This is assuming your B21f has the same sender set up?) __________________ 2004 V70 2.4SE Auto 'The Welshmobile’ 2002 Laika Ecovip 400i ( Motorhome on an Iveco 2.8TD) http://www.gitessouthbrittany.com/ http://moncopainmonchien.jimdo.com/

Nov 4th, 2015, 12:18	#11
YogaBone Junior Member Last Online: Apr 26th, 2020 13:08 Join Date: Apr 2015 Location: Toronto	how very interesting-tx again

Nov 4th, 2015, 14:23	#13
YogaBone Junior Member Last Online: Apr 26th, 2020 13:08 Join Date: Apr 2015 Location: Toronto	Thanks Paul-from what I understand Volvo issued an advisement in the early 80s that the in tank pump in the older models should be upgraded to the newer one. this is what is in mine and I think it's ok-I can hear it working (I know that doesn't mean it's working properly) but it was tested more than once and always comes up ok. I think I'll try to investigate the hoses to start and go from there, it may well be that this sender is failing. does anyone know the proper procedure for 'jumping' the sender so I can see if it's a sputter or steady stream? guessing it needs to be done with the car OFF.

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