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1990 dodge shadow - fuel pump electrical wiring
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vio
Novice
Jan 9, 2006, 7:58 AM
Post #1 of 12
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1990 dodge shadow - fuel pump electrical wiring
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Hi,
I have a 1990 dodge shadow, which doesn't start. Apparently the fuel pump is not powered on. I checked the fuse and it is ok. Unfortunately, the Haynes manual I have does not have clear wiring diagrams, so that I cannot identify the fuel pump wiring diagram. I cannot even find if there is a fuel pump relay or not. Could you please help me on finding a better wiring diagram and on identifying the essential components?
Thank you very much,
vio
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 9, 2006, 9:39 AM
Post #2 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Can you tell if voltage gets to the fuel pump? (if so it may need the pump) If not, the owner's manual may list that it has a relay and where if you have the manual. Haynes can lack with lots of info. Hang in there, someone here may have some ideas for you soon, - T
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vio
Novice
Jan 9, 2006, 10:22 AM
Post #3 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Hi Tom,
No voltage gets to the pump, and I do not have the owner manual, but only the Haynes manual, which does not say anything about the fuel pump relay. I checked the voltage at fuel pump, as it is recommended in the book, and no voltage gets in (it is expected to be for about 2 seconds after key is turned on). I checked the fuse, which is ok, and also I saw that there is voltage at the fuse terminal, but i do not know where to go from here. Any help would be very much appreciated.
Thanks,
Vio
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 9, 2006, 1:57 PM
Post #4 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Hi,
Wish I could help more. I don't know those cars well. Some techs here may be off today but keep checking. I think DanD had a post about the electrics with fuel pump and if you have a moment do a search. It had pics and all showing stuff and where. Hang in there, -T
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vio
Novice
Jan 10, 2006, 8:29 AM
Post #5 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Thank you Tom.
Dan and Tom,
I found a post with the wiring diagrams for a 1995 plymouth acclaim. I tried to use them, but it seems that there is not a very good match with my older 1990 dodge shadow. Do you have any more thoughts on this.
Thank you very much,
Vio
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DanD
Veteran
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Jan 10, 2006, 2:56 PM
Post #6 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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I think these two diagrams should be closer to what you want.
According to these this system doesn’t use a fuel pump relay the auto shut down relay is what energizes the fuel pump or I should say the fuel pump fuse in the fuse panel, #2 fuse, 20 amp. So maybe go and check that fuse, to make sure it’s not blown and that there is power to the fuse during cranking.
You’ll also notice that the auto shut down powers the ignition coil and the fuel injector. Check if there is power to them during cranking. Let us know what you find.
Dan.
Canadian "EH"
(This post was edited by DanD on Jan 10, 2006, 7:52 PM)
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vio
Novice
Jan 22, 2006, 6:17 PM
Post #7 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Hello Dan,
Sorry for the delay, but I wasn't able to work on my car until this weekend.
Thank you for the diagrams. They were very useful. I found the auto shut down relay and the cause of it not working properly was a bad contact to the Single board Engine Controller. So, this problem has been solved, thanks to you. Now, the fuel pump is working properly (I assume), but the car still wont start. I checked the sparks and they seem to be OK, except that they were wet (which means that there is gas coming into the cylinders). Now, there is gas, there are sparks (although I can tell how good are they - any thought on this?), but there is no explosion though. Do you have any idea on what should I look for next?
Thanks,
Vio
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DanD
Veteran
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Jan 22, 2006, 6:53 PM
Post #8 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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For some reason the engine has become flooded, you may need to replace the plugs and try again.
Dan.
Canadian "EH"
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vio
Novice
Jan 24, 2006, 11:10 PM
Post #9 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Hi Dan,
I replaced the spark plugs with brand new ones, but it still did not make any explosion and it flooded again. I wonder if it is not too rich on gas. Is it any way to make a brute check on this?
Thanks,
Vio
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DanD
Veteran
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Jan 25, 2006, 5:04 AM
Post #10 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Rereading this thread we haven’t asked what engine size, I didn’t bother before because the fuel pump circuit is the same for a 3Lt V6 and the 2.2Lt or 2.5Lt 4 cylinders. But now that you have fuel and still a no start condition the 6 and four cylinders start to become different for fuel control and ignition.
Dan.
Canadian "EH"
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vio
Novice
Jan 25, 2006, 12:39 PM
Post #11 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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Hello Dan,
It is a 4 cylinders 2.2L non turbo engine.
Thanks,
Viorel
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DanD
Veteran
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Jan 26, 2006, 5:15 AM
Post #12 of 12
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Re: 1990 dodge shadow - fuel pump electrical wiring
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You’re sure that there is good spark getting to the spark plugs? You can test it by unplugging an ignition wire at a spark plug, insert a screwdriver into the wire so it will not fall out. Now hold the screwdriver against the cylinder head, have someone crank the engine for you. As the engine is cranking slowly move the screwdriver away from the cylinder head. What you want to see is that the spark can jump at least ¼ inch and have a bluish color to it.
There is a chance you may get zapped with about 40,000 volts, so try not to be touching any part of the car, you don’t want to be the ignition coil’s path to ground.
You could also unplug the fuel injector at the throttle body to stop fuel flow while you’re doing this test that’s so the spark plugs do not get socked with fuel again.
Dan.
Canadian "EH"
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