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Mechanixrule
Date registered: Dec 1899
Location:
Vehicle(s):
| 280 ge won't start
I have a 1982 280ge that doesnt appear to be getting power to the fuel pump. if I jump a hot wire to the pump it starts & runs fine. I traced the wires back to the firewall, but once they go inside I lose them. The fues panel has 12 buss bar style fuses, and only 6 of them seem to be powered. the truck has a webasto & there are 3 "dangling" fuses behind it all the fuses are ok, so where is the power gone? any help would be great, thanks. oh, on a side note, there is this "sensor" on the front crank pulley, with a 3 wire plug coming out of it. it's just hanging there. (the plug) does it need to be plugged in anyplace? |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: 280 ge won't start
Mechanixrule - 7/15/2007 12:40 PM
I have a 1982 280ge that doesnt appear to be getting power to the fuel pump. if I jump a hot wire to the pump it starts & runs fine. I traced the wires back to the firewall, but once they go inside I lose them. The fues panel has 12 buss bar style fuses, and only 6 of them seem to be powered. the truck has a webasto & there are 3 "dangling" fuses behind it all the fuses are ok, so where is the power gone? any help would be great, thanks. oh, on a side note, there is this "sensor" on the front crank pulley, with a 3 wire plug coming out of it. it's just hanging there. (the plug) does it need to be plugged in anyplace?
Hi and welcome. Please go to the My Profile link (upper left side of this page) and complete it with your location and the year and model of your G.
Does the engine start and run when you jumper the fuel pump? |
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Mechanixrule
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: 280 ge won't start
Yes , the engine starts & runs great when I jumper the fuel pump. There is talk of bad relays in the dash for the fuel pump? I cannot find them. behind my glove box is nothing. just the inside of the firewall. |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| Re: 280 ge won't start
Mechanixrule - 7/15/2007 1:26 PM
Yes , the engine starts & runs great when I jumper the fuel pump. There is talk of bad relays in the dash for the fuel pump? I cannot find them. behind my glove box is nothing. just the inside of the firewall.
The relay is located high up above the driver's left foot under the dash - inside the truck. |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| Re: 280 ge won't start
Try this article: http://www.clubgwagen.com/gtech.php?pageTitle=G-Tech%20Article&sid=item&tid=57 On the 82, look for a black box on the left wall of the driver's (left) side footwell, about the size of a pack of cigarettes. That's teh FP relay. -Dave G. |
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Mechanixrule
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: 280 ge won't start
Thanks alot, It's broke down in a friends driveway about 30 minutes away, I'll be using that troubleshoot document then. Just out of curiosity, why does only 1/2 the fuse panel have +12v? the fuses from the left to right are #1 to #12 I assume, if so, #1 - #6 have no #12v? is there 2 feed wires for +12v to the panel? |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| Re: 280 ge won't start
1-6 are all headlight, turn signal, etc type stuff and come of the headlight or turn signal stalk switch. No power there until something's activated. 9 should have fulltime BAT power (cigar lighter), and 10-12 on with IGN. Wiring diagram is here: http://autos.groups.yahoo.com/group/usgwagen/files/ You might have to join the group to see it. -DAve G.
Edited by hipine 7/15/2007 1:55 PM
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Mechanixrule
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: 280 ge won't start
so the dealy on the front of the crank? it looks to be a crank position sensor, but the wire plug end was just hanging on some mounts. i see that the thing needs a tach signal to run the fp relay. where is the sensor that drives this? |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| Re: 280 ge won't start
Mechanixrule - 7/15/2007 12:29 PM so the dealy on the front of the crank? it looks to be a crank position sensor, but the wire plug end was just hanging on some mounts. Well, "dealy" is closer to the truth for that thing than "crank position sensor"  All it does is provide a pulse on each engine revolution (maybe at #1 TDC?). It's only used when external equipment plugs into the socket on the left inner fender well. The socket is where that wire is supposed to terminate. i see that the thing needs a tach signal to run the fp relay. where is the sensor that drives this? The sensor is in the distributor (see the gray wire with a BIG round black plug going into the silver ignition control box on the left inner fender well? You can see it pictured in step 1 here http://www.clubgwagen.com/gtech.php?pageTitle=tech%20article&sid=item&tid=25 ) and the signal to the fuel pump relay should come from the ignition box somehow, though I don't see the wiring on the diagram I referenced. That diagram is an older type, like my 1980 used, and I don't think it has all the goodies of the later trucks (for instance, no pole # 50 on the fuel pump relay as shown in the diagnostic article). But since my truck was an older type, I'm a little out of my element here. Hopefully someone with a more contemporary 280GE to yours will pipe up and can better help you with with diagnostics. Good luck! -Dave G. |
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Ed Mclass
Expert
Date registered: Apr 2006
Location: Nashville, Tennessee
Vehicle(s): 1958 180a, 2010 GLK, 2000 G 500, 2005 SLK 350
Posts: 1215
| Re: 280 ge won't start
The relay is also the same on the sedan. I took my failed one off a 1986 to a scrap yard and got another for $25. I didn't say what is was for. I just asked if they had one "like this." |
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clubgwagen.com
Elite Veteran
Date registered: Apr 2006
Location: gwagenpreserve.com
Vehicle(s): 300GE Cabriolet
Posts: 736
| Re: 280 ge won't start
contact me offline, i have a whole shelf of relays from 280GEs and 230Gs
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Mechanixrule
Date registered: Dec 1899
Location:
Vehicle(s):
| RE: 280 ge won't start
Well, I got to the driveway, replaced the 2 blown dangling 25a fuses, removed the FP relay, banged it on the ground a bit, put it back in & vvvvroom. ran great, took it for a 2 minute drive, call it umm fixed. lol. going to buy me a new relay in the near future. thanks alot guys. you guys are great. |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| Victory!
Heck dude, you could probably drive it this way for another 10 years if you don't mind banging the relay on the ground once or twice a year.  -Dave G. |
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elevatorbernie
Expert
Date registered: Aug 2006
Location: Vancouver B.C. Canada
Vehicle(s): 1989 280GE
Posts: 1347
| RE: Victory!
If he had 2 blown 25A fuses, I doubt it's the relay. Only a short circuit to ground would blow them...if the coil was shorted, banging it on the ground would not fix the problem. Also bad contacts wouldn't cause the current to go over 25A burning the fuses. Unless the sets of contacts inside the relay had shorted together, forming another circuit and somehow caused a ground blowing the fuses; then banging may sovle it temporarily. However, if that's the case the problem will come back soon enough. I think the problem is somewhere in the wiring. Maybe the dangling fuses? |
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Mechanixrule
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: 280 ge won't start
I thought the dangling fuses were for extra add-ons like the webasto... I just replaced them cause I saw they were blown. They didnt blow again tho..... I thought the fuel pump fuse was #12 (on the extreme right of the fuse panel - buss bar panel) pitty I didnt try starting it without the dangling fuses... maybe I'll try tommorow. |
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