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Fuel pump relay failed.
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ultrarunner View Drop Down
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    Posted: July-05-2020 at 3:51pm
Well, cheers to having that spare fuel pump relay, as it saved the day on the water. Launched the boat this morning, cranked it, and it soon died, wouldn’t restart. Turn key on, no pump sound. Swapped out the one relay (the one on the dongle) and was GTG 🙂 I’ll change out the other and put a couple more spares on board.
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Bringing the following back up:

Originally posted by 8122pbrainard 8122pbrainard wrote:

The failure rate of the relays seems pretty high due to reports here plus the fact that some even carry spares. Yes, they are a common relays used for many applications in automotive but the application on a inductive load causes arcing of the contacts that drastically reduce the life especially on a DC inductive load. When designed, someone missed the fact that arc suppression is needed. It's a simple RC circuit that's simple to add. Commercial snubber modules are even available. Snubber modules


Or just buy plenty of spare relays.


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77 Tique

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Keep it original, Pete
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You could read the rest of the thread that Pete pulled that quote from if you click on the link below

link

Then you could probably say "yep, I (and the previous owner) got my money's worth from that relay and carry a couple spares like you plan on.

To quote someone here on CCF..................."keep it original"   
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Jonny Quest View Drop Down
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Note to self: “buy spare fuel pump relay for boat glove box...”
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Originally posted by Jonny Quest Jonny Quest wrote:

Note to self: “buy spare fuel pump relay for boat glove box...”


JQ

Write that note twice or make your note say "buy 2 relays"

Since the ECM relay and the fuel pump relay are the same relay and a bad ECM relay will not allow power to the fuel pump relay, it's a lot easier to "shotgun it" and replace both at the same time instead of swapping relays around to figure out which one is bad when you're 20 miles from the launch ramp

Then later on you can figure out what's good and what's bad
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ultrarunner View Drop Down
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Yep, always replace in pairs. My second one here tomorrow. Plus two spares. Odd my NAPA didn’t have them.
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8122pbrainard View Drop Down
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Originally posted by ultrarunner ultrarunner wrote:

Yep, always replace in pairs. My second one here tomorrow. Plus two spares. Odd my NAPA didn’t have them.

Didn't have the specific brand you wanted? They are generic.


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Grand Poobah
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Originally posted by KENO KENO wrote:



You can walk into your favorite parts store and ask for a blower motor relay for a 1990 Cadillac Fleetwood, Brougham or an Eldorado too, for example and get the right relays for your gt40


I just figured I'd post this from an older thread and all those Caddy words will probably send Pete on a trip down memory lane    

The part number is Echlin AR-174
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ultrarunner View Drop Down
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Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by ultrarunner ultrarunner wrote:

Yep, always replace in pairs. My second one here tomorrow. Plus two spares. Odd my NAPA didn’t have them.

Didn't have the specific brand you wanted? They are generic.


Yeah, wanted the USA Hella.
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Kevin's '79 View Drop Down
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I just bought 2 Hella Relays from Nautique Parts. What P/N do you buy from your local auto parts store?
My '97 SN
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I wouldn't mess around with just a couple spares. Go for this to keep on board


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Originally posted by Kevin's '79 Kevin's '79 wrote:

I just bought 2 Hella Relays from Nautique Parts. What P/N do you buy from your local auto parts store?


The Hella relay in the link or any of the Hellas in the cross reference at the bottom of the same link will work

link
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Originally posted by 8122pbrainard 8122pbrainard wrote:

Bringing the following back up:

Originally posted by 8122pbrainard 8122pbrainard wrote:

The failure rate of the relays seems pretty high due to reports here plus the fact that some even carry spares. Yes, they are a common relays used for many applications in automotive but the application on a inductive load causes arcing of the contacts that drastically reduce the life especially on a DC inductive load. When designed, someone missed the fact that arc suppression is needed. It's a simple RC circuit that's simple to add. Commercial snubber modules are even available. Snubber modules


Or just buy plenty of spare relays.

I think a few spares is the easy way to go, but rather than a diode, why not a capacitor?  At least in the olden days, that's how I got rid of arching on a relay.
Gordon '97 Ski Nautique, GT40
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