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HondaPlatinum, A Technician
Category: Honda
Satisfied Customers: 11334
Experience:  13 year honda platinum level
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Had a p1457 on my 2003 Honda CRV, saw a video and cleaned

Customer Question

Had a p1457 on my 2003 Honda CRV, saw a video and cleaned the vapor canister shutoff valve and then got a p1456 code for small leak. Since it changed from a large leak to a small one, I replaced it, still got p1456. Then I replaced other solenoid valve, I think its called the purge valve, still get the code.
JA: How old are the hoses? And what driving conditions do you most often encounter?
Customer: I replaced several of the hoses too. Im thinking maybe some sand got sucked into the system.My son took the car to the beach and it bottomed out and knocked the whole evap canister and stuff off it's rubber mounts and one of the hoses was off.
JA: Are you fixing your CR-V yourself? What have you tried so far?
Customer: I already told you what was changed. Is this a script running?
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 11 months ago.
Category: Honda
Expert:  david craig replied 11 months ago.

Hi Im David and thanks for visiting the site. chance are a plastic evap line got damaged and unfortunately the only way to find the leak if it not visible is to have a smoke test done on the evap system.

Expert:  david craig replied 11 months ago.

do you still need assistance?

Customer: replied 11 months ago.
I'll be doing a smoke test this weekend and I'll follow up if nothing is leaking.
Expert:  david craig replied 11 months ago.

ok bud thanks

Customer: replied 11 months ago.
Did a smoke test with a homemade smoke device and didn't see any leaks. Then pulled about 20in vacuum on the lines and nothing put very slow loss of vacuum which was probably at the connections. Took off what looks like a solenoid valve at the intake manifold and sand came out. Wow.. Quite a bit, so I blew out the line to the canister and towards the solenoid valve where it meets the valve at the intake. It appears like the solenoid valve is fine when I try to suck through it. I'm afraid I may have sucked sand right into the manifold so I'm going to change my oil today. Should I activate the solenoid valve and blow though it? is it 12V? What else would you suggest?
Expert:  david craig replied 11 months ago.

yes, do that

Expert:  david craig replied 11 months ago.

any luck?

Customer: replied 11 months ago.
I blew through the solenoid several times and changed my oil, then reset the codes. I will not know if it's fixed until 10/19 since it takes about an hour of driving back and forth to work.
Expert:  david craig replied 11 months ago.

ok. keep me posted

Customer: replied 11 months ago.
Well, 2 P1456 codes are back! What do you suggest? I have already tried the gas cap several days ago before I cleaned out the sand from the line going into the intake manifold. Solenoid there works fine also.
Expert:  david craig replied 11 months ago.


Expert:  david craig replied 11 months ago.

Missing Fuel cap - Incorrect fuel filler cap used - Fuel filler cap remains open or fails to close - Foreign matter caught in fuel filler cap - EVAP purge control solenoid - EVAP canister - Fuel tank pressure sensor

Troubleshooting DTC P1456 (EVAP system leakage [fuel tank system]) Pinch off all the hoses between the fuel filler neck and the fuel tank, and retest. If the leak stops, replace the fuel fill cap first. If you’ve still got the leak after replacing the fuel fill cap, then replace the fuel filler pipe. There’s an O-ring between the plastic and threaded part of the filler neck that may be leaking.

Customer: replied 11 months ago.
How do I tell the hoses running between the filler neck and the fuel tank? Do I have to drop the fuel tank?
Expert:  david craig replied 11 months ago.

unfortunately yes. chances are anyways, the problem is going to be on top of the tank

Customer: replied 11 months ago.
Can you give me a description on dropping the gas tank for my CRV? I have found the access to the fuel pump under the rear seat. I've looked on some honda forums and haven't found anything specific to getting access to the top by dropping the tank.
Expert:  david craig replied 11 months ago.

ok. allow me a few moment to get you those instructions. thanks.

Expert:  david craig replied 11 months ago.

i cant find any instruction on removing the tank. let me keep looking.

Customer: replied 11 months ago.
Before I drop the tank, can you provide which lines I should pinch going to the fuel filler neck and tank to rule that out without removing the gas tank?
Expert:  david craig replied 11 months ago.

sure, let me work on getting a diagram of the top of the tank to point out the vent hose and pressure hose for you.

Expert:  david craig replied 11 months ago.

ok. up under the vehicle, on the side that the filler tube is there is a vent tube. its metal but turns into a rubber hose. thats what needs to be pinched off. ive circled the areas where the rubber hoses go.

Customer: replied 10 months ago.
This is turning out to be a nightmare. Sorry for the long delay, but I replaced the valve at the engine which supplies vacuum since it had a small leak but still have the problem. To pinch the rubber hose to the gas tank, is the hose about a quarter inch or is it a larger size? I can't tell from your diagram and there are several hoses coming off of the EVAP canister, and valves. Can you tell me where the hose connects to the whole evap system so it is easier to find?
Expert:  david craig replied 10 months ago.

sorry bud, im out of ideas. will opt out ans let someone else chime in.

Customer: replied 10 months ago.
I haven't heard anything back yet since the 12th. What's next?
Expert:  justinsbg replied 10 months ago.


My name is ***** ***** I would be happy to help. Are you still needing assistance?

Customer: replied 10 months ago.
I'm trying to determine the cause of my P1456 (small leak). I've replaced several components but it still is set. It's probably easier for you to read through this whole thread. We were trying to see if the leak was from the gas tank to the evap system in the rear of the car. I was asking the other tech the hoses to clamp off to separate the tank from the evap components because he sent me a picture that was hard to tell what hoses he was talking about.
Customer: replied 10 months ago.
Justinbg never even waited for me to respond before referring to another mechanic. I guess thats how this works, the people who have high ratings just answer the easy questions!!! What a joke. I called to refund my money since no-one wants to try a difficult problem. Don't waste your money on this service!