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Hi all I gotta a leak on my e350 coming from the right side fuel pump. It only leaks on a full tank, I've replaced the green rubber seal that's inside but I noticed theres studs that hold the pump in place that have broken. Theres 10 mm nuts the go on to it and the stud from one has just come off. I've searched for hours online but can seem to find what the part is called. Any help will be appreciated thanks.
Hi all I gotta a leak on my e350 coming from the right side fuel pump. It only leaks on a full tank, I've replaced the green rubber seal that's inside but I noticed theres studs that hold the pump in place that have broken. Theres 10 mm nuts the go on to it and the stud from one has just come off. I've searched for hours online but can seem to find what the part is called. Any help will be appreciated thanks.
Hi - I'd like to know how you solved this problem. I replaced the fuel pump cover (it was leaking gas) and, unfortunately, one of the studs snapped and I haven't been able to find anything on line related to this issue. It did not take much force for the stud to snap. I'll appreciate some help. Thanks!
sorry to hear about your fuel leak and broken stud problem. I'll be curious to hear about a great fix for that.
Would you be comfortable drilling your tank rim at low speed to insert a better machine screw?
There are 6 screws normally in use, perhaps you can leave with one missing if Indeed the tank seal does not done need pressure to seal (finger tight nuts).
Last edited by CaliBenzDriver; 03-01-2022 at 10:17 AM.
hmm, I just looked up the parts for my wife's car, and the ring is described as a bayonet, and no studs OR nuts are shown at all. but her car is a 2016 e350 wagon
k, looked up a random 212.056, which is a early (M272) E350 sedan, it too has a bayonet locking ring holding the fuel pump assemblies in place, the aux pump on the right, and the main pump on the left.
oh wait, no, the earlier style sedan shows 12 total 'nut and washer assemblies' (6 per side?), and those have a note: OBSERVE WORK INSTRUCTIONS IN WIS AP47.00-P-4750-TZV ...
no studs are shown, leading me to believe they are part of the gas tank assembly.
ok, let me dig out that WIS page.... this is always a fun adventure, I have to fire up a VM, and sometimes it works, other times it crashes.
ok, AP47.00-P-4750-TZV is completely useless, its all about how you purge the tank before working on it, then pressure test for fuel leaks after.
gahhh, as is too common with WIS, I'm lost in a sea of useless information. I'm guessing those nuts should have /very/ small torque on them
Last edited by Left Coast Geek; 03-01-2022 at 04:53 AM.
The fuel pump/sendor housing mounting studs are part of the fuel cell/tank.. if ones is busted or spins freely, that's a problem. Replacing the stud will depend on the damage and whether the part is available or alternate solution can be found.
Well..if one or more of the studs are loose or broken the tank should be removed and correctly repaired.
Having said that.. I would give a rivnut and bolt a try in place of the defective stud.
Drain the tank first. Maybe run some compressed air inside to dry it out before any drilling takes place.
May have to use a tiny oring around the bolt to seal the threads.
05-10-2019, 01:22 PM
