|
|
|
|
|
#1
11-20-2004, 02:50 PM
|
||||
|
||||
300TE fuel delivery issues
A long while back I asked a question as to the number of fuel pumps my wagon had and was told in no uncertain terms there was only one. Well, I currently have a gas leak and in poking about under the car found not one but 2 pumps. Imagine my surprise. Turns out the leak is in the hose between the 2 pumps, expensive sucker! All the hoses look rough so I'll be replacing them all (as well as the filter) which leads to my questions.
What is the fuel accumulator?  Is it likely to need replacement? How do I check it? How do I test the fuel pumps to make sure they are both good? The car acts like it is running out of gas after it uses about 13 gallons (coughs, misses, stalls) but is cured with a fill-up. My gut tells me this points to a bad pump or a bad pickup hose in the tank. Is there such a thing? I'd like to take care of all the potential fuel problems now while the car is up in the air and not have to keep bringing it back in to the shop (it's my daughter's college car). Any info would be appreciated. Thanx.
__________________
1999 E320 (gave to daughter) 250K 1994 F150 (may be the end of its road) 240K 1989 560 SL (Reassembly after paint job) 160K 1986 560 SL (deceased., gave it's life protecting my wife) 1988 300 TE (departed) 1994 945T (still running strong with an upgraded cam) 349K 1986 242Ti (deceased) 1968 GT500KR (under restoration) 
|
|
#2
11-20-2004, 03:06 PM
|
|||
|
|||
|
If fuel flows readily from the tank when the level is where you have a problem the problem probably isn't in the tank.
The accumulator stores fuel pressure as is not needed except for hot restarts. It is not designed to hold pressure over night and from a cold start plays no part in running. It also plays no part in running at any time. Its purpose is to hold pressure on the injectors and prevent fuel boiling and vapor lock when the car has sat for a short period HOT. The fuel pumps are usually replaced as a pair if the delivery pressure and volume are not up to specification.
__________________
Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
|
|
#3
11-20-2004, 05:37 PM
|
||||
|
||||
|
OK, thanks, that answers my questions on what the f.accumulator does but how do I test it? Does it have a diaphragm? Should air flow freely through it? Does it just sit there and supply pressure because half of it will be full of compressed air? Just trying to understand the mechanics of the system.
__________________
1999 E320 (gave to daughter) 250K 1994 F150 (may be the end of its road) 240K 1989 560 SL (Reassembly after paint job) 160K 1986 560 SL (deceased., gave it's life protecting my wife) 1988 300 TE (departed) 1994 945T (still running strong with an upgraded cam) 349K 1986 242Ti (deceased) 1968 GT500KR (under restoration)
|
 |
| Bookmarks |
|
|
Linear Mode
