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Im having missfire inssues 92 ls400 when at half a tank

Customer Question
Hi, im having missfire...

Hi, im having missfire inssues 92 ls400 when at half a tank or less

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix with a Lexus. The Lexus Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.

Ls400 bogging sluttering chocking when half a tank of gas or less

Mechanic's Assistant: Are you hoping to fix this yourself?

Yes

Mechanic's Assistant: Great! What have you tried so far?

Fuel pump

Submitted: 2 years ago.Category: Lexus
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Customer reply replied 2 years ago
only after 15 mins of driving it bogs down and splutters ONLY with half a tank of gas or less
Customer reply replied 2 years ago
no issues when full tank
Answered in 2 hours by:
4/27/2016
Lexus Mechanic: Toyota Service, Lexus and Toyota expert replied 2 years ago
Toyota Service
Toyota Service, Lexus and Toyota expert
Category: Lexus
Satisfied Customers: 5,224
Experience: 30 + years of experience; Multiple Award Winning Svc Mgr; Just Answer Customer's Choice Award Winner
Verified
Hello. Welcome to Just Answer. Please allow me to assist you. Based on a misfire at 1/2 tank, my initial hypothesis on this would be a crack in the pickup tube that is connected to the fuel pump. As long as the potential crack is below the surface of the fuel, the pump will pull fuel thru the crack. When the fuel level drops, the pump will pull a little air out of the tank thru the crack, instead of fuel. The recommendation I have for you on this request would be to inspect the fuel pickup tubing very carefully, and perform a leak down test. If any evidence of a leak is found, replace the fuel pickup tube.
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Customer reply replied 2 years ago
I replaced the top rubber hose because it was split, Do you think it would safe to remove the inspection cover and turn the key and make it prime and have a look inside to see if it squirts out of anywhere ? Thanks a lot
Lexus Mechanic: Toyota Service, Lexus and Toyota expert replied 2 years ago
Thanks for the reply. No, I would not remove the inspection cover and see if it squirts out. The issue is the tube pulling air. You will not see a squirt as the fuel is being drawn up the tube. The fuel pump draws the fuel & pushes it to the engine. The only way you would see a squirt would be in the line after the outlet of the pump. Also, if you get the pickup screen above the fuel, you will starve the fuel pump from fuel..This could damage it. You do not want to pull the inspection cover up with the pump running. This really sounds like a problem in the pickup tube at the level of the gasoline in the tank when it misfires.
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Lexus Mechanic: Toyota Service, Lexus and Toyota expert replied 2 years ago
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Customer reply replied 2 years ago
thanks again for your help, it has been very helpful as i would of never of thought to check what you have suggested above, i will have a look and carry out tests and report back if unsuccessful, thankyou
Lexus Mechanic: Toyota Service, Lexus and Toyota expert replied 2 years ago
You are very welcome. Glad to help.
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