89 spider graduate fuel pump blown - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 10 (permalink) Old 07-28-2017, 03:29 PM Thread Starter
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89 spider graduate fuel pump blown

Hi ,my 89 graduate is blowing the fuel pump fuse (30 A),i change it and starts and blows right away,any recomendations ????
Thks.
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post #2 of 10 (permalink) Old 07-28-2017, 03:34 PM
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You posted in the 164 forum.

I don't have my wiring diagram in front of me, but I think on the S3 that fuse also protects he in-tank pump and the O2 sensor heater (it definitely does on the S4). For staters, unplug the two-wire Bosch connector to the O2 sensor and see if that fixes the the problem.

If nobody else beats me I'll check the wiring diagram tonight for other ideas.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #3 of 10 (permalink) Old 07-28-2017, 04:25 PM
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That's was the issue with my 86. Inline fuse would blow and I would lose my main pump. The issue was a short in the in-tank unit. My mechanic changed out the sending unit and that fixed the problem.
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post #4 of 10 (permalink) Old 07-28-2017, 05:14 PM
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Yeah, just checked: fuse covers O2 sensor heater, main fuel pump, in-tank pump, and AAV. Likely one of those.

Also, in the wiring diagram that's an 8A fuse, not 30! I'm not sure what's correct, but if it's supposed to be 8 and someone stuck in a 30 to keep it from blowing that's not good.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #5 of 10 (permalink) Old 07-28-2017, 05:51 PM
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(I took the liberty of moving this thread to the Spider section.)

Indeed the correct fuse for that location is 8 amps.

- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina


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post #6 of 10 (permalink) Old 07-28-2017, 06:46 PM
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Quote:
Originally Posted by Gubi View Post
Yeah, just checked: fuse covers O2 sensor heater, main fuel pump, in-tank pump, and AAV.
Wow, great info! Thanks for posting. I always thought it was just for the pumps.

Mike

'87 Quadrifoglio
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post #7 of 10 (permalink) Old 07-28-2017, 07:59 PM
But Mad North-Northwest
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Yeah, I've seen a surprising number of O2 sensor heaters short out, which blows the fuse. Go figure.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #8 of 10 (permalink) Old 07-28-2017, 10:09 PM
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Once you find the short. You should use a 15 amp fuse for the circuit. The 8 amp the manual calls for is really to low for what the circuit pulls once it has some age on it.

Besides thats what they told us to do. When I took one of the Alfa factory Spider classes back in the day.

1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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I just got 2 more. Now I have a Matta. I must be crazy.
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post #9 of 10 (permalink) Old 07-29-2017, 07:17 AM
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Quote:
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Once you find the short. You should use a 15 amp fuse for the circuit. The 8 amp the manual calls for is really to low for what the circuit pulls once it has some age on it.

Besides thats what they told us to do. When I took one of the Alfa factory Spider classes back in the day.
Also good to know. I've blown the 8 (7.5) a few times over 5-7 years. Next time its going to a 15.

Mike

'87 Quadrifoglio
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post #10 of 10 (permalink) Old 07-29-2017, 07:10 PM
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I thought the main fuel pump fuse was the 8amp one under the rear parcel shelf?

Richard
76 Alfetta GTV gone to rust haven, 89 Spider the red graduate, 86 GTV6 on wish list
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