s.i.f.i.

On my way to my pals' shop to do engine mounts and the car just up and died on the freeway. No dash warning lamps, cranks but no start. Got it to an offramp and onto a flatbed, and now I get to hope this is the only reason for the sudden total shutdown. Damn damn dammit.

boostedfe3

Check your fuel pumps. Mine blew the 30 amp fuse in the trunk near the fuel pump relay.

s.i.f.i.

:/ will do...

abaykal

I had the same thing happen to me. it was the CPS. I then installed a CPS from AdvancedAuto and that did not fix it. turned out AdvancedAuto CPS was defective as well. Got a Bosch CPS and it works like a charm. I say start with CPS. cheapest and easiest fix.

s.i.f.i.

Fuel pump fuse. So tomorrow I'll call the dealership, since they just replaced the tank and both pumps, and ask them why it would want to blow the fuse. I suspect the car will get to go back to them to fix whatever they got wrong.

Hulk

Did you change the fuse and it worked?

s.i.f.i.

Yep. For how long, I don't know. I do want the dealer to find the underlying cause...

Hulk

Weird, let us know what they say

s.i.f.i.

Yeah. Less than a month ago they replaced the leaky tank, and both pumps, under warranty. And under the Law of What Got ****ed With Last, whatever it is they did must come under suspicion. I suppose it could simply have been that time for that fuse, but I can't figure it hurts to have then go over their work. And I'll be carrying a spare fuse regardless.

Hulk

I could see they fuse blowing because the old pump was using more Amps but with a new one doesn't seem normal

ryback

The fuel pump relays could be going out too.

s.i.f.i.

Well i'll be... I got to take a good look at the fuse. Yes, it is no longer cunducting electrons. but it didn't blow. I see no sign of melted metal, black or white soot, bubbled plastic, or any of the other signatures of a 30 amp fuse getting overloaded. It just broke. nice clean busted edges and a loose chunk of conductor rattling round in there. We put an amp meter on the circuit and started the car and measured 11.3 amps, which seems like a lot but well within what a 30 amp fuse can deal with. I think maybe I just got "lucky" and spent 250 bucks to deal with a metalfatigued fuse. I think I'll go ahead and replace all those big oversize fuses, just to get proactive on it.

s.i.f.i.

Aaaaand I was wrong about that fuse. Magnifying glass and daylight, says it blew. So it went back to the dealer. They took a look at everything, and found nothing wrong. Relays tested good, pumps are as they should be (good thing, being's how they're brand new), and all wiring checks out. But apparently this car has both pumps running at all times, and the database says it's supposed to have a 40 amp fuse instead of a 30. So, fine. They put a 40 in and I'll just assume that's the end of it.

Hulk

So why was there a wrong fuse in there??

s.i.f.i.

It came to me that way, my pal's E55 has a 30 there, but this one wants 40... so 40 it gets!

sexyxe

Best to be sure and make it 55.

Hulk

^^^ crazy **** lol

AMGPilot

I'm willing to bet that it's the fuel pump relay and really socket on the right rear wheel house next to the airmatic tank.

My relay socket was toast as was my relay from corrosion. replaced the socket and relay and no more sudden shut downs and both better idle and performance!

s.i.f.i.

They told me they looked the relay over, but I haven't, so I best to take a look...