Test for Leaks — Restore Water and Test for Leaks
Part of project
How to Fix a Leak at a Faucet Supply Line Connection · Step 8 of 9
In this video
Once all connections have been made and are hand-tight plus a quarter turn with a wrench, slowly turn on the hot and cold water stop valves. Open the faucet to purge any air from the lines. Carefully inspect all the new connections for any signs of water leakage or drips. If a leak is found, shut off the water and slightly tighten the leaking fitting.
Goal: Turn on water and check for leaks
- Turn the water on slowly to avoid a sudden high-pressure surge that could cause a loose fitting to pop off.
- Use a dry paper towel to wipe each connection; even a tiny amount of moisture will be easily visible on the paper.
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FAQs
How long does this repair typically take for a beginner, and what's the real difficulty level?
This is a beginner-friendly project, usually taking 30-60 minutes once you have the right parts. The most challenging aspect is often working in tight, cramped spaces under the sink. Taking your time to ensure proper alignment and avoid cross-threading is key to success.
How do I know which new supply line to buy, especially regarding size and length?
Before purchasing, measure the length of your old supply line from end to end. Note the connection sizes: faucet connections are typically 1/2 inch FIP, and shutoff valve connections are commonly 3/8 inch compression. Bringing the old line to the store or taking a picture of the connections can help ensure you get an exact match.
I replaced the supply line, but it's still leaking. What should I check next?
First, ensure both ends of the new supply line are hand-tightened, then given an additional quarter to half-turn with a wrench – avoid overtightening. Check that the rubber washer (gasket) inside the supply line nuts is properly seated and undamaged. If the leak persists, the shutoff valve itself might be old and failing, or the connection point at the faucet could be compromised.
What if I can't turn off the water supply to my faucet, or the shutoff valve itself is leaking?
If the existing shutoff valve is stuck, leaking, or won't completely stop the water flow, you will need to turn off the main water supply to your entire house before proceeding. In such cases, or if you're uncomfortable with the main shutoff, it might be best to contact a qualified plumber, as replacing a main shutoff or a frozen fixture shutoff is a more advanced task.
Test for Leaks — Restore Water and Test for Leaks
Part of project
How to Fix a Leak at a Faucet Supply Line Connection · Step 8 of 9
In this video
Once all connections have been made and are hand-tight plus a quarter turn with a wrench, slowly turn on the hot and cold water stop valves. Open the faucet to purge any air from the lines. Carefully inspect all the new connections for any signs of water leakage or drips. If a leak is found, shut off the water and slightly tighten the leaking fitting.
Goal: Turn on water and check for leaks
- Turn the water on slowly to avoid a sudden high-pressure surge that could cause a loose fitting to pop off.
- Use a dry paper towel to wipe each connection; even a tiny amount of moisture will be easily visible on the paper.
Frequently Asked Questions
How long does this repair typically take for a beginner, and what's the real difficulty level?
This is a beginner-friendly project, usually taking 30-60 minutes once you have the right parts. The most challenging aspect is often working in tight, cramped spaces under the sink. Taking your time to ensure proper alignment and avoid cross-threading is key to success.
How do I know which new supply line to buy, especially regarding size and length?
Before purchasing, measure the length of your old supply line from end to end. Note the connection sizes: faucet connections are typically 1/2 inch FIP, and shutoff valve connections are commonly 3/8 inch compression. Bringing the old line to the store or taking a picture of the connections can help ensure you get an exact match.
I replaced the supply line, but it's still leaking. What should I check next?
First, ensure both ends of the new supply line are hand-tightened, then given an additional quarter to half-turn with a wrench – avoid overtightening. Check that the rubber washer (gasket) inside the supply line nuts is properly seated and undamaged. If the leak persists, the shutoff valve itself might be old and failing, or the connection point at the faucet could be compromised.
What if I can't turn off the water supply to my faucet, or the shutoff valve itself is leaking?
If the existing shutoff valve is stuck, leaking, or won't completely stop the water flow, you will need to turn off the main water supply to your entire house before proceeding. In such cases, or if you're uncomfortable with the main shutoff, it might be best to contact a qualified plumber, as replacing a main shutoff or a frozen fixture shutoff is a more advanced task.