air intrusion
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Joined: Nov 2004
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air intrusion
i need a list of all the likely spots to look for air intrusion. my truck after a 4 hour or better sit is a white smoke hard starting #@#@. i replaced the line that went from the filter to the injection pump, it was cracked. and it still is a hard starter, especailly when park with its nose up hill. i dont understand that part of it. thankyou matt
92 7.3 banks sidwinder 94 ip
92 7.3 banks sidwinder 94 ip
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Joined: Sep 2006
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I had problems starting my 84 IDI...I had air in the system, cut & plugged the return line from the filter to the #1 injector, fixed the air problem but still hard to start....just installed new glow plugs, starts with no problems at all....going to replace the #1 plastic T with a single outlet, same as #2 injector.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
I will answer the last part first.
The reason it is harder to start when the front is uphill is because when the engine is higher and the tanks are lower, the vacuum created in the fuel lines is greater. So it will suck in more air faster.
If you park on a steep enough hill with the engine downhill it is possible for the rear tank to be level with the top of the engine, so no vacuum is created and it will start easy.
Now the bad part, your leak could be on a line under the truck anywhere between the IP and fuel tank. I wish I could point you right at it but I can not. Fuel line air leaks are the hardest things to find. It could be in either line, supply or return.
The only thing I can say to help is do a very close inspection of the metal fuel lines at every clamp and fitting from the tank selector valve to the engine. Rust buildup around a clamp may indicate the problem area. Also look for signs of fuel line movement that may have rubbed a hole in the line.
The reason it is harder to start when the front is uphill is because when the engine is higher and the tanks are lower, the vacuum created in the fuel lines is greater. So it will suck in more air faster.
If you park on a steep enough hill with the engine downhill it is possible for the rear tank to be level with the top of the engine, so no vacuum is created and it will start easy.
Now the bad part, your leak could be on a line under the truck anywhere between the IP and fuel tank. I wish I could point you right at it but I can not. Fuel line air leaks are the hardest things to find. It could be in either line, supply or return.
The only thing I can say to help is do a very close inspection of the metal fuel lines at every clamp and fitting from the tank selector valve to the engine. Rust buildup around a clamp may indicate the problem area. Also look for signs of fuel line movement that may have rubbed a hole in the line.
Last edited by Dave Sponaugle; Oct 28, 2006 at 09:23 PM.
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crazymike
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
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