Hi guys,
I had a 320 coupe SEP 1987 -which was running faultless- in storage for seventeen years . As a result of that storage I had too many problems with component seizures. I owned that car since late 80's and it had only 110k kilometres mainly done on motorways. The car was totally free from any corrosion. I managed to put it on the road, but soon it burst twice a fuel hose next to fuel filter. Following tests I found elevated fuel line pressure of 7.5 bar. The problem was pinpointed to a blockage in the fuel return pipe which is immersed in the fuel tank (63L, single pipe on the fuel pump housing, twin sender units, fuel pump in-tank). I applied 12 bar pressure to unblock the pipe with no success. Any idea how to go about to sort out the problem without made the modification with a twin pipe fuel pump housing to enable me to connect the incoming fuel return pipe to it, so bypassing the existing blocked return pipe which is immersed in the tank?
Any suggestion is welcomed.
Thanks
Fuel Return Pipe Blockage inside fuel tank (63L)
Moderator: martauto
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aimlessrock
- E30 Zone Squatter
- Posts: 1821
- Joined: Sun Dec 06, 2009 11:00 pm
- Location: Manchester
removing the fuel pump and inspecting it and the crud that's in the tank would be a starter for 10. The cabbies have a drain plug on the bottom of the fuel tank - assume the tin tops do also?
E30 320i Convertible (1989)
190 Mercedes (1988)
"there is nothing more expensive than a cheap E30"
190 Mercedes (1988)
"there is nothing more expensive than a cheap E30"
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goris
- E30 Zone Newbie
- Posts: 3
- Joined: Mon Jun 19, 2017 11:00 pm
Thanks for replying.
The fuel pump has already been replaced as the old one was seized due to long car storage with the fuel tank partly filled. The tank was found clean without any sludge.
Now I have already emptied the tank and removed both housings which accommodate the pump and sender units. From the apertures there is little one can see or do. It seems that the return pipe changes diameter inside the tank, and acts as a siphoning system to equalise the fuel levels in both sides. It becomes larger and has pinholes in the left side of the tank.
The question is how one can access the inside from a small aperture to locate where is the blockage and rectify it. Having said that most probably the blockage happened due to electro-chemical corrosion rather than the sludge.
The fuel pump has already been replaced as the old one was seized due to long car storage with the fuel tank partly filled. The tank was found clean without any sludge.
Now I have already emptied the tank and removed both housings which accommodate the pump and sender units. From the apertures there is little one can see or do. It seems that the return pipe changes diameter inside the tank, and acts as a siphoning system to equalise the fuel levels in both sides. It becomes larger and has pinholes in the left side of the tank.
The question is how one can access the inside from a small aperture to locate where is the blockage and rectify it. Having said that most probably the blockage happened due to electro-chemical corrosion rather than the sludge.