The fuel pump starts to make some humming noise. So I assuming is the fuel pump. I would like to know whether I need to change the fuel pump module( if any?) or just the fuel pump. How much would this cost?A question about mercedes w124 fuel pump 1989?
First of all, Bandit-05 is probably the most knowledgeable person in the Mercedes Benz forum and his answers are always useful and correct. I am a fellow MB enthusiast still trying to learn about as much as I can about MB's.
If your fuel pump is making noise, then the fuel pump relay is probably good. Your problems could possibly be a clogged fuel filter, or malfunctioning fuel pump or two. The pumps can become unreliable or fail on high mileage cars with noisy operation being an early warning sign. If you suspect the fuel pump relay then a easy way to test it is to take the fuel pump relay out and get two pieces of wire and wrap them around pins 7 %26amp; 8 (look at the bottom of the relay and your will see numbers on it) and connect the two wires together %26amp; put the relay back in to bypass the relay (the relay is basically a big fuse). Used relays should be very inexpensive too (about $30.00 on ebay and about $5.00 to $20.00 from a junkyard or craigslist) and new relays cost about $110.00.
As for your fuel pump issue, I don't know if your car has two pumps or one (depends on the exact chassis serial number) but I wish there was simple way to determine this. As a example I own a 1988 %26amp; 1989 300SE (W126) with a M103 engine and they both only use one fuel pump. I had to recently replace the fuel pump on the 88 300SE and called the dealer about a replacement pump and they quoted me about $380.00 for a OEM Bosch unit. I found the exact same unit at autohausaz.com for about $150.00. I found generic compatible fuel pumps on ebay for about $110.00 brand new.
What I ended up doing (because I couldn't wait) was calling around to my local junkyard (pull-a-part) to see what type of MB's they had in their yard. They told me they had three 190's (W201) in their yard so I went and looked at them. Two 190's used a two pump setup and one 190 had the one pump setup with the exact fuel pump I needed. I pulled the part (which cost me about $8.00) and did the replacement myself (first time replacing a fuel pump) without jacking up the car in about 40 minutes. When you replace the fuel pump it is recommended that you replace the fuel filter as well (cost under $20.00). Below is a DIY link on how to replace a fuel filter and pump on a W140, which is basically the same as on the W126, W124, and W201.A question about mercedes w124 fuel pump 1989?
I dont really know this one BUT check if the screws are loose.A question about mercedes w124 fuel pump 1989?
The pump is working hard to push fuel through a clogged filter.
Change the fuel filter, the noise will probably go away.A question about mercedes w124 fuel pump 1989?
First of all, your car actually has 2 fuel pumps, not just one (assuming your W124 has the M103 inline 6 engine). If you're referring to the relay as the 'module', that is not the problem. If the relay goes, the pumps won't work so it's basically like an on-off switch for the pumps.
Happy may be on the correct path by suggesting a dirty fuel filter. According to Benz maintenance schedules, it should be changed every 4 years or 96K km / 60K miles.
Cost? Depends on what's wrong...A question about mercedes w124 fuel pump 1989?
if driving you are not having any problems, you may not need to replace the pump, ist make sure the pump is secure, which could be the reason its making noise, and change the fuel filter while you are there,its most likely way pass due..
