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Old 11-19-2018, 11:25 PM
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Oil pressure sender as fuel blanking plug

I have one of those Holley fuel distribution splitter lines with the gauge. The gauge itself started leaking fuel today so I plugged the port it with a spare oil pressure light sender at lunch.

Will this do as a permanent fix? Or should I park ir until I get a proper blanking plug. I figure it's fine with the 7psi of pressure, but will the fuel damage it internally?

Thanks.

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Old 11-20-2018, 05:15 AM
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For a couple of bucks, go to Home Depot and get an 1/8" NPT plug. Don't take a chance with a fuel leak / fire. Not fun!
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Old 11-20-2018, 07:07 AM
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Apparently "Makeshift" is an appropriate screen name...
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Old 11-20-2018, 08:27 AM
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Quote:
Originally Posted by '48 Austin View Post
For a couple of bucks, go to Home Depot and get an 1/8" NPT plug. Don't take a chance with a fuel leak / fire. Not fun!
You're right, the more I think about it, the crazier it sounds to chance it over a few dollars.

I smelt fumes as I pulled into work, and scrounged up the old pressure switch from my roadkit in the trunk to plug that hole so I could get it home in the afternoon.

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Old 11-20-2018, 08:32 AM
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In fairness, I'd be lying if I said that I never made a roadside fix like that and then drove thousands of miles before making a proper repair...
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Old 11-20-2018, 10:13 AM
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Makeshift see picture. This could be you. It's not worth messing around.
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Old 11-20-2018, 08:54 PM
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Quote:
Originally Posted by Makeshift View Post
I have one of those Holley fuel distribution splitter lines with the gauge. The gauge itself started leaking fuel today so I plugged the port it with a spare oil pressure light sender at lunch.

Will this do as a permanent fix? Or should I park ir until I get a proper blanking plug. I figure it's fine with the 7psi of pressure, but will the fuel damage it internally?

Thanks.

Sent from my GT-I9507 using Tapatalk
NO! They can and do leak through their core, go to the hardware store and get the proper pipe thread plug which is probably a 1/4 NTP.

Bogie
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Old 11-20-2018, 09:22 PM
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Originally Posted by BogiesAnnex1 View Post
NO! They can and do leak through their core, go to the hardware store and get the proper pipe thread plug which is probably a 1/4 NTP.

Bogie
Thanks Bogie, sounds like the general consensus is that it's unsuitable (outside of a last resort get me home situation).

The correct blanking plug is indeed on it's way to me now.

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Old 11-21-2018, 06:43 AM
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If you have fuel leaking inside the vehicle, you have bigger problems. No direct fuel pressure should ever go inside the vehicle. You use either an electric sender and gauge, or a fuel pressure ... I forget what it is called but it separates the actual fuel from a different line going into the cabin.
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Old 11-21-2018, 07:43 AM
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We've owned three Cadillac CTS's since 2004, the first two required (3) new OP senders due to leakage through the core centers. The '16 V-Sport hasn't had that problem yet...

Russ
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Old 11-21-2018, 12:45 PM
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Quote:
Originally Posted by 55 Tony View Post
If you have fuel leaking inside the vehicle, you have bigger problems. No direct fuel pressure should ever go inside the vehicle. You use either an electric sender and gauge, or a fuel pressure ... I forget what it is called but it separates the actual fuel from a different line going into the cabin.
Apologies for the confusion, it was just one of those cheapie gauges on the fuel inlet rail, No fuel inside the cabin.

Pics of a generic rail, and my 'repair'.

Funny thing is, I threw that old oil pressure switch into my kit just in case I needed to plug anything with a 1/8th NPT port. I thought it was overkill, but since it took up virtually no space I thought what the hell. It sure saved me a bunch of hassle having it handy this time around.

Last edited by Makeshift; 11-21-2018 at 01:07 PM.
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