Performance Fuel Pump 190e 2.5 16v

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Sallps

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Jun 5, 2021
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10
Location
London
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190e cosworth 2.5 16v
Hi guys, hope everyone is well, i have a 1989 190e Cosworth 2.5 16v, I’m looking at upgrading the fuel pump, any suggestions guys?? What have you guys used?
Thanks
 
Hi guys, hope everyone is well, i have a 1989 190e Cosworth 2.5 16v, I’m looking at upgrading the fuel pump, any suggestions guys?? What have you guys used?
Thanks
If you’re running the standard Bosch fuel injection system then there is no need/point in upgrading.

You have two fuel pumps on your car, along with the filter and pressure accumulator.

Best bet is to keep it original but ensure everything is 100% up to spec.

You would probably find the strainer in the tank is likely pretty blocked by now too if it’s the original from 1989 so would be a good time to refresh that along with the other items in that area :thumb:
 
Hey Will, ah thanks bud, basically I’ve been having a issue, when the cars driven in warm conditions after a while I get power loss about 4K rpm, and on afew occasions it’s died on me, then leave it a min or so start up and go, funnier enough the ABS light also started flashing at this time. Thought it could be a fuel pump issue, there doesn’t seem to be anything astray under the hood.
 
Hey Will, ah thanks bud, basically I’ve been having a issue, when the cars driven in warm conditions after a while I get power loss about 4K rpm, and on afew occasions it’s died on me, then leave it a min or so start up and go, funnier enough the ABS light also started flashing at this time. Thought it could be a fuel pump issue, there doesn’t seem to be anything astray under the hood.

Worth checking your OVP relay if you’re getting an ABS light as well as those symptoms.

What’s the mileage and history on the engine out of interest, have you checked the basics - valve clearance, timing, compression etc?

Manual or auto?

Would love to see some pics of your car, I’ve had a few over the years - sold my last one a few months back. Great memories :cool:
 
Yea I have read that the OVP relay may need replacing, it’s done 95k miles, full service history and a manual. No haven’t gone that far in yet!!
I’ve had the car for 3years bought from auction, such a beauty to drive Will, just puts a smile on my face and others lol

I have modified it, but tastefully lol
 

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Yea I have read that the OVP relay may need replacing, it’s done 95k miles, full service history and a manual. No haven’t gone that far in yet!!
I’ve had the car for 3years bought from auction, such a beauty to drive Will, just puts a smile on my face and others lol

I have modified it, but tastefully lol
I think we need to see more photos of your very nice w201. :thumb:
 
Hi Guys, I took the car for another drive today, not as long as before but the central amber hazard light came on, on a few occasions, also noticed a slight misfire when chafing through the gears, any suggestions to what’s up??
 
Central amber light sounds like the ASD warning.

Perhaps some of these problems are linked? The ASD utilises the same speed sensors as the ABS, but coupled with your rough running and ABS light coming on/off I would start off by checking the voltage to these systems - likely culprit would be the OVP relay.

What size tyres are you running btw, front and rear? If you have incorrect rolling radius tyres you could end up triggering the system if the rotation throws the speed signals out.

Where abouts are you based?
 
Hi Will, ok I did enquire about the OVP relay with Mercedes and it will be special order, which takes about 6weeks. I did purchase two fuel pumps, I’ll get that changed. I’m running 165/40/17 fronts, and 205/40/17 rears. I’m in west London, Hayes.
 
Hi Sallps,

If the tyres sizes are as you have posted you will almost certainly see some issues relating to the different rolling radius between the front and rear axles, this could be related to your apparent ABS/ASD issues.

I would advise if you are changing the fuel pumps to replace the filter and the strainer in the tank as well. It is easier to drop the whole sub assembly for the pumps/filter and do the work off the car.

Try and run the fuel level down to avoid having to drain as much fuel first, the strainer requires a large size socket to remove.

Are you doing the work yourself or do you have somewhere to take it?
 
Yea I have read that the OVP relay may need replacing, it’s done 95k miles, full service history and a manual. No haven’t gone that far in yet!!
I’ve had the car for 3years bought from auction, such a beauty to drive Will, just puts a smile on my face and others lol

I have modified it, but tastefully lol
Wow !!!

Love that so much better than all the new Amg offerings, congrats and enjoy.
 
Yes I ended up ordering the filter and strainer too, well I was going to get garage to sort this out. Would you be able to recommend any Mercedes specialists? 😬
 
Yes I ended up ordering the filter and strainer too, well I was going to get garage to sort this out. Would you be able to recommend any Mercedes specialists? 😬
Wayne Gates is superb and not to far from you -

 
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Depending on which type of OVP relay you have it may be repairable---the components are mounted on a small PCB inside the can which can develop dry joints or cracks in the soldered joints with age. All it takes is to run over the joints with a small soldering iron to reflow the solder and the jobs a good un..
probably a few how to's on youtube

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Hi Grober, yes I was running through YouTube and came across the OVP relay repair.
 

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