Help Needed - Possible Knackered Fuel Pump?

[Banshee]

feed line 8mm I.D
return line 6mm I.D

So if the feed line is already 8mm, replacing it with 8mm ID rubber hose wont make any difference to the volume of veg that comes through

 

[Lazy-Ferret]

Have you had the sender out yet? I thought when I was talking to Rick one time, he said there was s gauze on it that could cause issues.

Maybe as an easy test you could try using a low pressure air line to blow back down it and see if it clears for a short time.

sent from my phone, sorry for any typo's.

 

[Banshee]

Have you had the sender out yet? I thought when I was talking to Rick one time, he said there was s gauze on it that could cause issues.

Maybe as an easy test you could try using a low pressure air line to blow back down it and see if it clears for a short time.

sent from my phone, sorry for any typo's.

Interesting!!!! Sounds like it could be a winner
I might pull it out later after work

 

[Gazza]

When you flushed out the bits of plastic it improved the situation. Its likely that you didn't shift all the bits of plastic and there is still some in there. Also if there is a gauze in the fuel tank how did the plastic get in? Either no gauze filter or there is a component made of plastic that is breaking up.

 

[Lazy-Ferret]

Interesting!!!! Sounds like it could be a winner
I might pull it out later after work

Just found this old post, it's a filter on the petrol, and a plastic swirlier on the TDi.

http://www.nissan4x4ownersclub.com/forum/showthread.php?t=20491&highlight=fuel+tank+pickup

 

[Banshee]

Just found this old post, it's a filter on the petrol, and a plastic swirlier on the TDi.

http://www.nissan4x4ownersclub.com/forum/showthread.php?t=20491&highlight=fuel+tank+pickup

Was just looking at the workshop download as you posted this, should be easy enough to remove I hope, how should I be cleaning it?

And is it removable via the inspection hatch?

 

[arcascomp]

A thought on your ID hoses - the original metal one will and does corrode, that ends up reducing the ID of the original pipe as it can corrode inside too (I am told). Therefore a shiny new replacement pipe of original ID will probably help things regardless although I have heard of others fitting bigger bore pipes to increase flow rate.

 

[solarman216]

if your primer plunger is being sucked down then you have a problem filter to tank, next to test is remove the hose from the outlet from the tank, it has arrow on side of plastic, extend it into a temporary fuel container and take it for a drive do not forget a gallon will not go very far as the return will be going into the main tank, you could of course place both pipes in the slave tank but just be sure which is which, if it now runs OK then the problem is junk in the tank, if it is still the same replace the pipe tank to filter, Rick

 

[briggie]

diesel bug ?

 

[AlexD333]

diesel bug ?

Yummy :augie

 

[panelbeater]

have you got this sorted yet.ring me if not.

 

[Banshee]

have you got this sorted yet.ring me if not.

I'll give you a bell later mate, still need to sort this as there is def a blockage again as it's now struggling with Diesel :doh

 

[solarman216]

have you lifted the plate rear right boot floor and accessed the fuel pipes? Rick

 

[dave123]

have you tried checking it in stages?. like take the fuel lines off the tank and extended the pipes and run from a jerry can and then connect some lines on the filter end to the jerry can . that would tell you if its your filter and housing or the sender on the fuel tank or fuel lines and then check them individually as in feed and return . but by the sound of it you have picked up a lot of sediment in your tank .

 

[Banshee]

Are you prepared to be educated and entertained my pretties?

I've sussed it but not tested it fully yet, I was so excited I've dashed back in the house, washed and thought i'd inform you all first :lol

I'd recently found out that shaking the car seemed to help for whatever strange reason even if it only helped for a few miles or so, armed with this info I started going down the route of thinking that the pickup pipes and whatever gubbins was in the tank might be blocked

I started by first replacing the fuel lines with 8mm and 6mm ID SAE fuel hose respectivly which didn't resolve the issue :doh so I then bypassed the fuel filter and primer head by putting a glass filter and priming bulb in line which again didn't make a difference and true to form the priming bulb was also sucked in and started to deform, the filter was also hardly filling up

At this point I bypassed everything and then ran a new pipe from the tank straight the pump and still had the same issue which meant either the injector pump had give up the ghost and stopped sucking or there was a serious problem in the tank

Earlier that morning I decided to go to the scrap yard and "practice" on the one that was in there as noone here can seem to agree on what is actually in the tank.

Here's some photos of step by step removal;

Voila!!!! One sender unit, it basically comprises of a bucket that swirls and sucks fuel in from the bottom and your return spews it back into the same bucket, the black contraption you see is a piece of hollow plastic that floats on the top of the fuel in the tank sending a signal to your clocks showing how much fuel you have which is what the plug is for on the top

So I eventually manage to remove my sender unit, rounded bolts and all and the tank looks fairly clean :thumb2 2 bits of debris what you can see there at the bottom which look like leaves and have now been removed, for reference the the circular washer with the nut coming through it is the drain point which can be accessed via the underside of the car with a 12mm socket

So OK lets look at my sender oh wait.......................................

 

[Banshee]

Are you ready for the video?

 

[Lazy-Ferret]

3 things...

firstly, what is the other sensor with the 2 wires going to it?

secondly, I take it the pictures are not in the order that you took them, e.g., the ones showing the sender are after you cleaned it

Lastly, from the pictures it is not clear, how does the fuel get into the bucket?, as it looks in the pictures, you would need 3 inches of fuel i n the tank to over flow into it.

 

[Banshee]

3 things...

firstly, what is the other sensor with the 2 wires going to it?

secondly, I take it the pictures are not in the order that you took them, e.g., the ones showing the sender are after you cleaned it

Lastly, from the pictures it is not clear, how does the fuel get into the bucket?, as it looks in the pictures, you would need 3 inches of fuel i n the tank to over flow into it.

Do you mean the one on the top of the pickup next to the fuel gauge sensor plug? If that's what you are referring to then I have no idea as there are no pins inside it, it is just a blank recess and no plug present :nenau

The other sender you can see in the blue car is me removing another one from one in the scrap yard before I attempted to do mine so I made any mistakes on this one and didn't knacker my own :thumbs

It's referred to as a swirl chamber, from what I can see it sits a bout an inch above the bottom of the tank and the suction of air from the IP causes the bucket to spin, on the sides of the bucket there are channels that whip the fuel up and into the bucket, the motion of the bucket spinning acts as a sort of centrifuge sticking the fuel to the sides until it reaches the pot

Still waiting on the Photobucket link for the video so I can show you me cleaning the inside out, you will all be horrified and running outside to clean your own

 

[solarman216]

the little gizmo with two wires is the low fuel light switch, the blanked socket is the one used by the petrol version to feed 12 v to the in tank pump, interestingly the flow and returns are reversed, so debris in the tank, could it be "diesel bug"? looks like caviare, Rick

 

[firebobby]

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