1996 7.3 Bone Stock - Crank No Start - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 2 (permalink) Old 09-25-2018, 03:03 PM Thread Starter
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1996 7.3 Bone Stock - Crank No Start

New member here, first post. I'm somewhat handy with a wrench on most gas engines but diesels are a new beast to me. I've got a crank no start issue going on right now, have replaced the camshaft position sensor, IPR valve, also replaced fuel filter. Plenty of oil in engine and HPOP. Have also tried disconnecting the ICP and cranking, still nothing. Engine will start and run a bit on alternative fuel (brake cleaner). Obviously I have a fuel issue. Have not connected to a computer to read anything. I'm narrowing down possible causes currently and I'm zeroing in on the mechanical lift pump. After replacing IPR valve, refilled fuel bowl with fresh diesel, bowl didn't drain while cranking, manually drained bowl and cranked again to see if pump would refill bowl, it didn't.

My question is, does the lift pump also provide pressure to drain the fuel bowl to injectors in addition to pumping in fuel to the bowl? If it does, I'm thinking I'll go ahead and replace the lift pump and see what that does for me.

Thanks in advance.
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post #2 of 2 (permalink) Old 09-26-2018, 01:45 AM
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Re: 1996 7.3 Bone Stock - Crank No Start

It is not necessarily true that you have a fuel issue. The Hydraulically actuated Electronically controlled Unit Injector (HEUI) system has a bunch of inputs used in controlling the fuel delivery. The fuel pump is a 2-stage pump. The pump draws fuel from the tank(s) through the transfer valve and provides the fuel to the filter at ow pressure. After being filtered, the low pressure fuel goes back to the pump and gets boosted to higher pressure to the fuel rails via lines to the back of each head. Excess fuel is then taken from the front of the heads to the fuel pressure regulator on the driver's side of the fuel bowl (and then excess back to the tank(s). What's the fuel level in the tanks? Have you tried switching tanks? With the age of our trucks, the "shower head" pickups like to disintegrate which causes problems with junk in the lines and transfer valve. You could hook up a dedicated container of fuel direct to the pump. Other questions: Wait-to-Start light coming on? Any Check Engine Light? Cheers!

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