Question about 1993 Toyota Pickup

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Fuel Pump I have a 2 c turbo diesel engine thats about more than ten years old. The engine runs fine till about a week ago, it wouldn't start when the engine has been stopped for more than 3-5 hours after. A. I replaced all the fuel hoses in the suction and discharge part of the fuel filter. B. The manual feed pump (manual pump on the fuel filter) works; gives off high pressure fuel when I take off the discharge portion of the pump. C. In the fuel injector pump assembly, I noticed there are some fuel coming out of the "return line" when I press on the manual feed pump. D. I have evaluated all the fuel lines and have not found any "stuck up lines". E. I inspected the fuel tank itself and found out that it is clean inside; suction line or the line that supplies the engine with fuel has a "pick up strainer" and it was in a very clean condition. F. I am 80% sure the glow plug is working properly since just a week ago I can turn the engine on almost instantaneously. G. I noticed that when the fuel is more than a fifth (in the fuel guage level) I can start the engine with no problem at all. Can you help me with this? I have a feeling that the fuel pump (not electric type) has a leak in its gaskets or something. In your opinion, could it be a leak in the fuel pump? Thanks for your time reading my problem. I would appreciate any advice from you gurus!!! engnurse@hotmail.com

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===
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