Intank fuel pump

Hi all, just wanted to know the signs of intank fuel pump being weak.  What would happen to engine how it would run and is there a way of checking it that it works as it should. Thanks in advance.

If the in-tank pump fails the usual warning signs are the rh rear wheel arch has a whine from the main pump having to work harder. More noticeable on less than a half a tank.

Seen where the pump will run for about 20 minutes over heat, and stop…then cool off and resume for another 20 minutes.  

A bad CIS fuel Pump Relay can give the same warning conditions.

On cornering you may feel hesitation, and a lack of power.  The interconnect hose for the pump can hole, and or fall off.

Loss of power is another…

Would misfire be 1 of them also

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Misfire would be all the time if the pumps on the way out…or even rust in the tank . if you think its the intank pump thats failing, its not too expensive, to replace both is the more expensive option.
https://www.classic-vw.co.uk/in-tank-lift-pump-191906092a-5174-p.asp   classic vw

http://www.golfmk1.co.uk/Items.php?cat=ALL&group=FUELPUMPS   crazyquiffs

https://www.vwheritage.com/357906092c-in-tank-fuel-pump-wit-strainer-19mm-vw-spare.

https://www.ebay.co.uk/itm/In-Tank-Electric-Fuel-Pump-For-VW-Golf-Jetta-MK2-Polo-Passat-Cabriolet-1-8-16V/253729021418?epid=2151361217&hash=item3b136d9dea:g:OpAAAOSwqVVbPDyC


whilst doing intank pump, you can check for rust and clean majority out..   my pumps are nosiy to be honest, constant sound, but i do have 1 of each pump spare…just incase .

Just checked the fuel line from metering head to injectors and 3 are blocked 1 is ok so now am in need of fuel lines.

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oh dear….. what size injectors are they 10mm or 12mm  i have a set of new hoses, that i ordered wrong size..  for the sportline..the injector in 2 cars was different.   
pm me if you want them ill measure them and confirm which size they are.. think 12mm is it the hose or meter head thats blocked?   if hose you could remove the blockage wth air or welding wire,  if its the injectors thats blocked then you can soak in fresh fuel… to see if work under pressure.

Hi
I think I have the same issues with my 86 gti cab…noisy main pump and cuts out after around 20 mins 
What is the best fix ?

First try replacing the in-tank pump.

1984.5-1993 mk1 How to change your in-tank fuel pump | Volkswagen Owners Club Forum

Thanks…. I will go down this route

I was thinking it maybe the relay