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#1
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Intermittent Fuel Pumps?
Has anyone experienced fuel pumps that are intermittent.
I am having a situation where the car will just die....and then not start for a bit. Changed out the fuel pump relay Changed out the OVP I have spares of each..in fact 3 fuel pump relays. I am wondering if one of the 2 fuel pumps is dying Otherwise the 300ce is running like a champ. Must be a gas delivery problem.. when it dies , it dies.
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
#2
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There are several ways to diagnosis,
If you have a volt/ohm/ammeter?? you can use the 10A section of the meter to watch the current draw from the pumps, about 6-8A. IF not you can make jumper wire to by-pass the relay when the car (pumps) don't allow the engine to run.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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Quote:
I don't know too much about electricity. It seems maybe the ovp is sending the fuel pump relay a signal to shut down. Maybe it's coincidence...but twice when i was stuck, i removed the ovp and the car started and i was able to get home. so i started thinking weak fuel pumps are drawing too much sending a signal to the ovp. maybe 22 years is the max for fuel pumps, even though the car only has 108k miles. in the interim, i probably will have to get some banana pins and jump the relay. Fortunately, I work out of the house most of the time...
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
#4
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Changed the fuel filter.....can hear pumps go on when you turn the key.
Now the car won't start. Moving on the crank position sensor and spark
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] Last edited by lee polowczuk; 01-27-2011 at 03:27 PM. |
#5
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I'snt the fuel pump relay just loosing the signal from the ignition switch. Try measuring the voltage from the ignition switch at the pump relay. Plug 15 if i remember right.
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600SEL '91 300E 4Matic '88 240D '83 280SE '77 350SE '73 The most complex systems can fail in the simplest way. Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis. i don't believe in the lord! He's never bought me a Mercedes Benz. |
#6
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No spark....looking more and more like cps
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
#7
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I replaced the crankshaft position sensor.
All is well. First CPS to go on me in probably 6 124's. I think it shorted out.... some bare wires at the bell housing end. The wire was also stiff.... new one if flexible. 70 dollar fix..... took me awhile.... had to work it from the top and bottom..... made progress once I removed the oil filter.
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
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