Today, I changed the fuel filter and fuel accumulator of my car because it was giving me some problems at start up and the engine sometimes suddenly stopped when driving. While doing this job, I realesed that one of the twin fuel pumps was rusty. So the problem may be the fuel pumps. Here is my question. Do I have to have the fuel tank empty in order to replace the fuel pumps? I had enought spill of gas when replacing fuel filter and fuel accumulator.
Answer to first question regarding the fuel tank, you can pinch it off on the hose coming out of the tank. However it is better to empty the tank. When I replaced my fuel pumps, I had a small amount of fuel in the tank, so I let it drain into a pan. Information I have read says you can pinch off that hose.
Second issue, non start, did you check to see if fuel pumps have connections intact. Also you may want to prime it by pouring a little gas into the air flow sensor. Your car should run and this will help to get gas into the fuel distributor.
Thanks 190benzo26sc for your reply.
Here is what happened later.
Because my car was not starting, I decided to put back the old fuel accumulator thinking that the new one I had just installed was factory damaged. The same, my car did not start. Then, I decided to put back the new one. After trying to get my car running the battery got dead. So, I wait 4 hours till help arrived (friend's jumping car), and I was surprised when my car started at the first try. Weird huh!!!!! Now, I am waiting on the arrival of the pumps. I will keep posting on this adventure.
Vehicle: '85 300E. unaltered and original. 276,000 kms
Location: Sydney, Australia
Posts: 55
At the risk of stating the obvious: did you by any chance reconnect everything, only to have the non-return valve facing the wrong way? I did just this same thing, and when cranking the starter for only a mercifully short time, was able to hear the pump straining against the 'obtruction' and releasing its built-up pressure back into the tank-side of the system. When it dawned on me what I'd done I dived back under and rectified things, and all has been well for the past two years.
Answer to first question regarding the fuel tank, you can pinch it off on the hose coming out of the tank. However it is better to empty the tank. When I replaced my fuel pumps, I had a small amount of fuel in the tank, so I let it drain into a pan. Information I have read says you can pinch off that hose.
Just had my fuel pumps replaced..........there is absolutely no need to empty the fuel tank. I watched my Merc mechanic do the work and it took less than half an hour.
Everything is connected right, car is running, yet I still have problems. In the mean while I am waiting on the arrival of the fuel pumps to have them changed, I would like to issue some problems that I need help with.
1) I replaced and adjusted the neutral switch because for a while my car was only starting on neutral. After being working fine for couple of days, it stopped starting on neutral all the time to just start starting at neutral intermittently.
2) Sometimes when I crank my car, it only doesn't start at the first crank, sometimes when I turn the key, it does nothing.
3) The ABS light turns on when I drive over 52 mph.
4) When driving, it dies on me lot of times, just to come back to life when I put it on neutral and start it again.
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300E 1993 121k MILES (MINE)
S500 2004 4 Matic 37,000 MILES (mine)
BMW 750Li 2007 15,700 MILES (Dad)
Lexus GS460 (Mom) 9,000 MILES (too much power)
2007 E350 4 Matic (Side Car) 11000 MILES
07 STi with a bit of work done to her... (brothers)
After almost 2 weeks of waiting I got the fuel pumps of my car that I bought on Ebay. While checking them out, I noticed that one of the pumps move inside when you shake it the other don't. Is this normal or could be something wrong? Is there a way of testing the pumps before installing them?
Fuel pump installation 
Linear Mode
