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fuel pump relay
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blargonator  



Joined: 22 Sep 2004
Posts: 100
Location: kalamazoo MI

PostPosted: Sat Feb 05, 2005 1:54 pm    Post subject: fuel pump relay Reply with quote

hi guys i finally bought my fuel pump relay and its the right part but for some reason it will not fit. is it possible to break the pins off in the slots? the last owner did some messed up stuff so im not sure.....oh yeah i have a 1977 924.
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CMXXXI  



Joined: 05 Nov 2002
Posts: 1939
Location: Vicksburg, MS

PostPosted: Sat Feb 05, 2005 3:57 pm    Post subject: Reply with quote

Are you sure its the right relay, or you are plugging it into the correct seat the correct way? (Sorry, gotta ask... ) There's only one orientation that the relay will fit correctly. If you were to pull the relay seat, you'd find that behind the slots that the relay fits in, it is really just female spade connectors. Highly unlikely that the relay's male "pins" broke off.
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Diesel  



Joined: 03 Nov 2002
Posts: 1061
Location: Ellington,CT

PostPosted: Sun Feb 06, 2005 12:17 am    Post subject: Reply with quote

Actually, I've seen it before. I had a relay in a parts car that left one of it's pins in the relay board because of a windshield leak that left some rust in the area.
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blargonator  



Joined: 22 Sep 2004
Posts: 100
Location: kalamazoo MI

PostPosted: Sun Feb 06, 2005 5:12 am    Post subject: Reply with quote

its the correct part and everything and i know i am trying it in the correct orientation but its just not working. i seem to have a problem with water getting under my dash like diesel said. last owner replaced the relay with a switch so i don't know if he did anything.
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Roger  



Joined: 06 Jan 2003
Posts: 1235
Location: Cordova, TN

PostPosted: Sun Feb 06, 2005 3:38 pm    Post subject: Reply with quote

Which slot are you putting it in? Since the previous owner modified the car it could it be possible that you are installing in in the wrong place?
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1981 924 NA

Some people are like Slinkies. Not really good for anything, but you
still can't help but smile when you see one tumble down the stairs.
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blargonator  



Joined: 22 Sep 2004
Posts: 100
Location: kalamazoo MI

PostPosted: Sun Feb 06, 2005 3:59 pm    Post subject: Reply with quote

im trying to put it into the correct spot that the haynes manual labels it as. the 2nd relay i think? he just took out the relay and replaced it with wires and a switch.
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blargonator  



Joined: 22 Sep 2004
Posts: 100
Location: kalamazoo MI

PostPosted: Mon Feb 07, 2005 9:12 am    Post subject: Reply with quote

ok got the relay in and then i found out my battery is dead. charged the battery for a good 4 hours. i can "crank" it but it won't start. what do you think the problem could be? im stumped now 8-\ if it helps it used to start then one day it just stopped. do you think it could be a lack of fuel or something?
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Khal  



Joined: 26 Sep 2003
Posts: 4872
Location: Sunny and lovely interior BC, Canada

PostPosted: Mon Feb 07, 2005 3:07 pm    Post subject: Reply with quote

I think lack of fuel is very likely! I had very similar symptoms some time back and it turned out the fuel pumps had failed.

Even if you can hear the pump running (I could) and there is fuel getting to the filter (mine had), it still doesn't mean that fuel pump is working -or at least working properly.

The only way I know of to test for sure is to fit another "known good" pump or to bench test your current pump (I'm unsure of the exact test procedure but others here can let you know).

On my car, there are two fuel pumps, one "in-tank" pump and one external pump. Both had failed. However, I think the '77 may have had only the external pump? (can anyone verify?)

There are a myriad of other things that might be causing your no-start problem -like, how long's it been sitting? Has the fuel turned to varish? -I'm not saying it's the fuel pump for sure.

But as I found out the other night (thanks Paul), test the simple stuff first! Is it getting fuel, is it getting spark...

A nifty trick Paul used was to disconnect each fuel line from the top of the fuel distributor in turn, and then crank the engine and see if any fuel comes out of the lines (I hadn't seen that done before )
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D Hook  



Joined: 02 Nov 2002
Posts: 3158
Location: Omaha, NE

PostPosted: Tue Feb 08, 2005 3:32 am    Post subject: Reply with quote

Stupid question but there IS fuel in the tank, right?
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blargonator  



Joined: 22 Sep 2004
Posts: 100
Location: kalamazoo MI

PostPosted: Tue Feb 08, 2005 7:11 am    Post subject: Reply with quote

yeah there i put in a couple gallons before the winter. its getting a spark but im guessing it something with the fuel system. i don't think there was much in there when i first got it and it has probably been in there for atleast 5+ years.
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CMXXXI  



Joined: 05 Nov 2002
Posts: 1939
Location: Vicksburg, MS

PostPosted: Tue Feb 08, 2005 9:17 am    Post subject: Reply with quote

blargonator wrote:
... i don't think there was much in there when i first got it and it has probably been in there for at least 5+ years.

I'd recommend starting from scratch and systematically checking/ testing/ replacing everything starting with the fuel pump and working your way forward.

Flush & partially fill the tank
Test the pump by direct 12v to ensure it actually works
<get the electrics sorted out - ignition switch, pump relay, etc>
Remove, drain, flush replace accumulators
Replace fuel filter
Flush lines all the way to fuel distributor head
Test system pressure and throughput
Test injector pattern and throughput

Many of us have been down this road...

If you don't do it systematically, you are leaving yourself open to having one fault or failure mask or contribute to another. As has been said many times on this Board, these CIS fuel systems don't like to sit for long periods without being exercised. They are pretty simple and reliable once things have been sorted out, but they can be sort of finicky to get straight once they are out of tune.

Do it one time, and do it right - you and your car will thank you.
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Khal  



Joined: 26 Sep 2003
Posts: 4872
Location: Sunny and lovely interior BC, Canada

PostPosted: Tue Feb 08, 2005 11:40 am    Post subject: Reply with quote

I agree with CMXXXI's post above.

But to this;

CMXXXI wrote:
...Test the pump by direct 12v to ensure it actually works...


I say again: Just 'cause the pump buzzes doesn't mean it's working properly. I hit mine with 12v direct and could clearly hear it buzzing but turns out that it had failed

Again, I don't want to imply that it's definitely the fuel pump. You need to be systematic, as CMXXXI says.
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leadfoot  



Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia

PostPosted: Tue Feb 08, 2005 5:20 pm    Post subject: Reply with quote

I'm pretty sure there's a quantitive test in the haynes manual for testing the fuel lines.
Rather than pulling everything apart, do this test. It should give you a indication of where you need to start looking. Yep page 79 of the haynes...
30 sec test should give you 750cc of fuel.
If this works then move onto the distibutor and injectors.... check your spark plugs too at this point, they may be fouled or in bad shape... they will also tell you know if your running too lean or your timings off.
leadfoot
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blargonator  



Joined: 22 Sep 2004
Posts: 100
Location: kalamazoo MI

PostPosted: Thu Feb 10, 2005 11:51 am    Post subject: Reply with quote

we are just going to try some starter fluid before we rip into anything but i had another question. can you use 8 amp fuses instead of 5s?
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Smoothie  



Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)

PostPosted: Thu Feb 10, 2005 12:08 pm    Post subject: Reply with quote

On what circuit/s do you have 5's? The lowest rated fuse in my car as I recall is 8.
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'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox
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