Toymods Car Club Inc: Tech & Conversions => fuel pump stops when hot (again)

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ChrisTH
Occasional Poster

Location:
Thailand
Registered:
September 2005

Re: fuel pump stops when hot (again)	Wed, 05 October 2005 15:02

Maybe I am just plain stupid, but here are my 2 cents. On my 1J engine I dont have a surge tank (as far as I know). I also read that a 5 liter engine running at 4800 rpms uses about .220 Kg of fuel per min. Most pumps, including in-tank pumps, can handle that without problems. That is only about 15 l/hour. BUT, I have seen my in-tank pump. It has a "macro"-filter to filter out large particles. What if you have dirt in your tank? The sediments, including rust, will collect in that filter, and prevent the flow of fuel. (my engine ran without problems for 2-3 years. It started after being parked for about 1 year). In case of a surge tank. Normally the purpose is to cope with excessive use of fuel, a buffer. Under normal conditions (supply from the tank is sufficient), there will be a flow back to the tank. Then you dont get "hot" fuel, it is exchanged all the time. If the flow from the tank is obstructed, what will happen? The fuel will circulate from the surge tank, through the rails, and back to the surge tank. No renewal of the fuel from the main tank. Then for sure you will get "hot" fuel. My symptoms are that there is not enough fuel after about 1-1 1/2 hour of running the engine. That is on hot days, cold days, in the city, and on the highway. Knowing that a normal pump will supply the same amount of fuel all the time, it points to one problem.... Dirt in the tank!! That would account for the timeframe. The dirt will collect in the "macro" filter depending on the flow of fuel and not on weather conditions. It could be, that in hot conditions it happens quicker, but that would also heat the fuel quicker. I dont know. Maybe I am just stupid. But for sure I'll let the local garage remove the fuel tank and clean it. Then I'll let you know if it solved my problem or not. [Updated on: Thu, 06 October 2005 00:58] [Report message to a moderator]

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