Fuel Pump not getting power - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 20 (permalink) Old 03-23-2010, 07:14 PM
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I pulled my double relay and the resistor appears to be 2.7 ohm (Red Violet Gold Gold) and tests at 2.8 ohm.

I did replace with a new 33ohm, but it didn't help. It got dark so I'll jumper and take to work w/multimeter in the morning.

-matthew
'87 Milano Gold
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post #17 of 20 (permalink) Old 04-19-2010, 07:41 PM
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Does anyone know the resistance value of the fusible link near the battery? Mine died too.
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post #18 of 20 (permalink) Old 04-22-2010, 12:22 PM
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You know, I now believe what I did when I repaired three of these double relays was to fix cold solder joints, which are known to exist in some Bosch components. The resistors in the units I looked at were so discolored/corroded I could not reliably read the resistance; lol, even when under a strong magnifying glass, the rings still don't seem to match up for ~2.7 ohms with either the 4 ring code or the 5 ring code for resistors, thus the confusion, alas.

The other thing I've noticed that goes wrong with Bosch relays is that the actual coil develops a break in the windings. That's pretty much it for that relay, as the coil cannot be easily taken apart for rewinding or replacement. Pity, as the darn things do cost ~$120 or so.

I get so upset with the uber high prices of the unreliable components (mostly Bosch) that I always try to repair or find a substitute for them. Missed on this one I think, but do check the solder points. As an extreme example, Ferrari charges ~$800 for a similar Bosch relay (yes, same crappy stock Bosch relay, also with failed open coil, with an additional $5 zener diode) whereas Porsche charges ONLY ~$150 or so for the same unit for the 928. Wouldn't mind finding a $35 replacement for the Milano double relay.

So, don't bother trying to replace the resistor, but do reheat the solder joints, and check the conductivity of the coil. Apparently worked for me anyway.

Del

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1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #19 of 20 (permalink) Old 04-22-2010, 01:28 PM
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I'm sorry, I never updated this thread.

It was a fuse, listed in the manual as "optional auxiliary utility"

I think fuse #20, but I do not remember.

-matthew
'87 Milano Gold
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post #20 of 20 (permalink) Old 05-10-2019, 04:46 PM
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Ok so I've got a 1987 Milano 2.5 V6 that is not getting power to the fuel pump. I've checked the wiring under the seats, the pump, the fuse, the relay and nothing is getting power but the fuse. I have no idea where the problem could be and I've got a voltmeter. Please help, it was running down the street and then it just died. The connectors on the relay aren't getting power but the relay click when I connect/disconnect the battery. Please help
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