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D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
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Fuel pump teaser!
So, what's this all about?
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. |
#2
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I know this is an old post, but I tried this MAGNETI MARELLI 313011300066 pump recently. It has the small output in the bottom to pressurize the venturi system, but I never got it to work unless I topped up the fuel level high enough to fill the collector, lets say, naturally by fuel level.
Then, I went to start the S8 in the garage, and now it is completely dead. Its not seized (like the one that came out), but even when wired direct to the pump, it does not run. It is behaving like an open circuit. Has anyone else fitted this Marelli Pump and had problems, either with normal fitting/operation or reliability? Richard |
#3
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We never fitted the Marelli pump to a car - its sitting in a box in my workshop.
Your fuel level problem sounds like the standard pump houing location issue tbh, but the pump dieing like that is sub-optimal. |
#4
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Quote:
I guess I am unlucky with the pump, but now I probably will not order another Marelli, I may just go for the VDO pump. cheers |
#5
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The hose for the return line needs to be tucked in to the pump bowl. I've seen the same problem when its been reassembled with that line loose outside the bowl.
Its not unheard of for the pump to be assembled correctly and everything to look right but it still doesn't work. There's legend of a mystery pipe inside the tank which can come adrift and also cause the problem. People have swapped the complete fuel tank to solve it. Its plausible that the Marelli pump has the stub but not the internal gubbins to push fuel through it. If it was reverse-engineered from the VDO unit the point of that outlet might have been missed and its simply a moulding artefact. Having not tested it myself I couldn't say whether it actually works as expected. The VDO pump is not really that expensive in the scheme of things. |
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