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jdemaris
05-01-2004 17:27:48
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Re: Hard start in reply to Chip Allard, 05-01-2004 08:11:33
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It doesn't need ANY fuel pressure to run, just flow. If it had its fuel tank on top of the engine, like in the older 1010 or 2010, there would ge no fuel pump. If anything, maybe you need a check valve in the fuel line to keep it from bleeding back . . . but the fuel transfer pump on side of the engine already has check valves if it's working properly. As far as pressure in the fuel line going to the pump, I've seen all kinds of electric fuel pumps hooked up to them. The little pulse electric pumps can be bought in low-pressure models and high-pressure, the low being around 2-4 psi, and the high around 6-7 psi. The injection pump already has it's own little low pressure vane-powered fuel pump inside of it, but it's not capable of drawing fuel - only pushing it, so all you'll be doing is running one fuel pump into another, and then into yet another. If you suspect a lack-of-fuel at startup problem, find out if the fuel is bleeding back overnight. When you go to start the crawler after it's been sitting, first loosen the nut on fuel line where it hooks to the pump, and then crank the engine. You should see fuel instantly. If not, there's fuel problem. Also, make sure, when you are checking the operation of the fuel pump, do it with the engine cranking and NOT with the hand primer. Those pumps tend to wear out on the engine driven part but still work well with the hand primer - so they can fool you. By the way, with a 450 crawler, if you just fill the fuel tank to the top, and then park it on a hill facing down, the fuel will gravity feed. So, if you do so, and it starts better - you've isolated a fuel problem.
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