mAMG

Hi all,

I was driving my car, and suddenly it turned off, tried to turn it on again but nothing.. I can hear the engine trying to turn on but it doesn't fire up.

Removed the battery ground wire but nothing . Left it for 2 days nothing also
Never turned on after it shut down when I was driving.

No message shows up at all, used OBDii no errors, changed CPS, nothing also

The mechanic told me its the fuel pump..

What do you think guys ?

Thanks

Critter

Check for fuel pressure at the fuel rail port, attach a gauge then turn the key on, check for pressure, then crank motor and watch fuel pressure. It is possible to be the pumps but check pressure first, could be a money saver. As a side note pull the back seat and check the top of the fuel tank, been known to melt electrical terminals going to the pumps, also a need for new fuel pumps, Good Luck.

shardul

iTrader: (1)

very likely a fuel related issue if the CPS is fine.

efiftyfizzle

Lift up the back seat and take off the cap for the fuel senders... see if your harness got shorted out by getting drenched in fuel. Happened to me... but luckily when the car was parked and not moving.

novae500

happened to me a few weeks ago. For some piece of mind, i went ahead and replaced DS sending unit, and PS fuel pump. It died while on the road and would continue to crank/shake but not turn over and start. Replaced CPS sensor, no luck. No fuel pressure at all at the port, could hear the buzz of the PS pump turn on, but no gas was going over from DS to PS. Once replaced both units, car started and running. Costs was $900 two pumps, $24 misc parts, and labor.

chawkins2001

If there are no messages or CEL's, one of your fuel pumps died. Happened to me a couple months ago.

E55Freak

me too..except my INDY diagnosed a bad relay and I was only out $225...whew! Check the fuel rail first for pressure...

novae500

lucky for you, relay was good, connections didnt melt, no fuel pressure at rail, no CEL. Only thing left was replace both units. Also make sure that you have 1/4 gas in the tank so less gas in the tank to unplug the two units thats inside the tank.

AMGPilot

$225 for a $15 relay? This fix is VERY simple. On the right side of the trunk remove the trunk liner panel. Just behind the air suspension resivor on the rear wheel arch are two relays, remove the black one, it will likely fall apart in your hand as you remove it. insert the new relay, button up the trunk and you're done. Total time 10 mins

I did the CPS and the cam sensor and I still got the random shutdowns, when I replaced the relay the issue went away. It's commonly misdiagnosed as a fuel pump issue and it's not it's a fuel pump relay issue

E55Freak

yea..i didn't know all this at the time..i did do the CPS myself but was just frustrated...and part of that labor was also throwing in a new pump i was gonna do myself as well.

mAMG

Today, we've changed the fuel pump, and still the car doesn't turn on ..

Taking it to the dealership for check ...

If it is not the pump and the Cps, what it should be then ?

Thanks

1970gsx

Did you change the relay? ^^^^^

Critter

As stated did you check for power to the pumps, there is a need to diagnose any issue with these cars fully as it is quite expensive to just throw parts at it, for all you know it is a fuse that does not power up the relay. Throwing large money on pumps to only see this action fail is not good for the pocket book. I take it you checked previously and found no fuel pressure and did check the connectors so now take a meter and check for voltage at the pumps then work back through the power circuit, relay, fuse, that is of course you have no pressure, did you check? has the car been hit lately or rolled over, there is a switch to prevent pump action from running if these occurrences have happened.

mAMG

Problem Fixed.

Before going to the dealership, they mechanic checked with Star diagnosis again and it showed that the part #0025421219 is defective. I guess it's the relay as mentioned above.

Changed it and the car worked

As the pump wires were melted, the mechanic recommended to change the pump too. He said if I left the current pump, the problem will happen again

Should I change the pump as a preventative maintenance?

Thanks a lot for the help guys,

novae500

At this point I would replace both pumps for piece of mind. You don't want to be stuck on the road and have to tow the car to the shop and get fixed. Yes it's pricey for both pumps, seals and labor. But hopefully will last another five or so years.

mAMG

Well, ya you are right. But for now I've told the mechanic to change the fuel pump only ( the one that was melted). Later I will change the second one for piece of mind

Thanks a lot for the help

MAN55LE

I think that that the recommended interval to change the fuel filter is at 60,000 miles .....I had both done at 56,000 as preventive maintenance and didn't want to do double labor. A strong and clean fuel system is key on these cars, especially if modified and/or driven hard or at WOT frequently for extended periods of time. Good luck

G_Money

Did you do it yourself? How much did you pay all said and done if you didn't?

Mantooth

Happened to me on the highway two nights ago. Probably the fuel pump, MB dealership is diagnosing the problem for me while I'm in LA.

AgSilver

Pump wires melted as a result of high current draw. Most likely your fuel filter is blocked and or the pumps are beyond service life limits.

AMGPilot

90% of the time it's the Fuel pump relay which is in the trunk on the right rear wheel arch

08E63AMGboy

Having this issue as we speak hope your still active seem very informative lol my fuel pump relay was on my left driver side in fuse box tho is this accurate? Or should I still be looking for a fuse on the right side ?! Thanks again