I encountered the same issue and after a lot of checking and reading I just bought 003 545 25 05 from VEMO, to my understanding this should work. Once received and tested I'll let you know.

 

Hi Bauk18,

Thanks for your reply. Yes I ordered the 2505 part. Let's see what happens

 

Welcome to the forum. I'm afraid your cheaper option there comes up as suitable for the six cylinder motors not the V8. From a quick search of the part number at least.

The car will probably run, but not correctly. The rev limit is contained in this unit for a start so that may make for an odd drive.

It's a pain in the arse isn't it. Another option would be getting your old one rebuilt, member JamesDean on here can do this and has a postal service. In the US though.

 

This is what convinced me to take the 27 euro VEMO: VEMO Relay, fuel pump V30-71-0026 for Mercedes-Benz

 

Hello NK & Welcome to BenzWorld!

In addition to the other's contributions.. Bauk is correct, that relay will work in your car. The 003 545 25 05 relay is original to my '91 500SEC...

Ian is correct that your original relay most likely can be repaired as well.. and its a DIY project.. Dead easy too.

Two years ago, once resoldered, I reinstalled my original and keep the modern knock-off as a spare [in the car].
Here are some pics from the parts catalog and details on where the solder joints go bad on the board.
You can see one of the open circuited cracked joints in the closeup below.

Good luck man.

MBL

 

Just a backup confirmation for this approach. Flatbedded home last year. Half hour to troubleshoot, 10 minutes to fix. Dont have to worry about compatibility/availability/cost.
Cheers.

 

Yeah no harm in trying it for that. Just keep an eye on it.

If you use advanced search in this community section, you can find details of another aftermarket one that can work. I've got one as a spare. One person had one melt, but others of us are using them with care. Mine is OK but doesn't bump the revs when the air conditioner comes on, as it should. Otherwise it's functional. I can't remember the details but it's all on here somewhere.

 

Hello,
I have the same issue. Let me know how you get on 👍🏼

 

Hello,
I have the same issue. Let me know how you get on 👍🏼

Oh yeah... What model do you have 😄

Yeah no harm in trying it for that. Just keep an eye on it.

If you use advanced search in this community section, you can find details of another aftermarket one that can work. I've got one as a spare. One person had one melt, but others of us are using them with care. Mine is OK but doesn't bump the revs when the air conditioner comes on, as it should. Otherwise it's functional. I can't remember the details but it's all on here somewhere.

Ok will have a look and see what it says. Thanks again for the advice 👍🏻😄

 

I was lucky enough to track down a NOS Gen I relay and installed it today. That means I have two spares. If someone wants a working relay, I can sell one of my spares for what I paid, which is $50 shipped. Both are 100% Okay.

 

i have a 500sec 1988 I was reading through this post so decided to check the part number on mine and it is 002 545 16 05 it seems this is for the 560 my engine is a hi comp 265hp am i running the incorrect relay if so how would this be affecting the engine.
i do get times when the relay stops and pumps dont buzz but new genuine relay did the same anyone had the ports the pins plug into enlarge

 

No offense meant, but adding your issue to this seems to muddy the waters, in my mind.

That said, please do look at: Каталог MERCEDES and fill in the blanks with your VIN etc.
Then save this as a favorite & go forward to find the part number.

You'll be able to look up part numbers for your car with ease... This site has been a godsend to me over the last six years at least.
That said, I have shared with fellow BW 126 enthusiasts since 2004 or so.m Just add your VIN, save and choosa as a favorite/shortcut.

Not 100% always dead on... but almost damn near for all these years.

Good Luck

MBL

 

Thanks for the link will go over and have a look I will start a new thread hopefully make it easier

 

OP: before you spent the money, did you jump the pins in the relay socket to prove that the relay was the problem?

 

Hi John,

No I didn't. How do you jump them?

 

Details are in the search archives on how to jump them. As John says it would make sense.
Worth checking out. Some cars were pins 7 and 8 but some cars different. Mine was the latter but I don't remember what those ones were. Maybe 30 and 87?

 

Ok will have a look 👍🏻

 

Any fuel pump relay will work the main difference is the rpm cutoff and none of us are taking our engines past 5000rpm

 

none of us are taking our engines past 5000rpm

Each to their own 😊

 

The new relay worked perfectly.

Big thank you to you all for the helpful advice 🙏🏻

 

Excellent

 

Some of us never exceed [or get up to 5000RPM I am told]..

When driving my SEC, I often like to plant the gas pedal and watch the tach & transmission spool up to the redline, then feel the upshift in my back.. as I smile from ear to ear..

My Inner-hoodlum appears.

With a custom exhaust that is even more satisfying......

Vroom Vroom!

Not e v e r y time, but.. you know...

 

Some of us never exceed [or get up to 5000RPM I am told]..

When driving my SEC, I like to plant the gas pedal and watch the tach & transmission spool up to the redline, then feel the upshift in my back.. as I smile from ear to ear..

My Inner-hoodlum appears.

With a custom exhaust that is even more satisfying......

Vroom Vroom!

😂😂
Sounds great.

What custom exhaust do you have if you don't mind me asking