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#1
08-02-2013, 02:13 PM
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closing IP return line harmful?
Am I inviting a problem if I pinch off the IP return line, close to where it comes out of the IP, and drive the car for miles?
What happens to the lift pump when it's deadheaded like this? Obviously there will lack flow through the IP, but I assume the lift pump will keep pulsing pressure into the IP delivering fuel at a rate that the car is consuming. Anybody done this?
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Cheers! Scott McPhee 1987 300D 
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#2
08-02-2013, 03:31 PM
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Why?
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro"
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#3
08-02-2013, 03:34 PM
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Isn't the return line from the ip a hard plastic pipe, and isn't it the one with the banjo bolt?
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2009 E320 Bluetec 117,000 1995 E300D 306,000 Sold 1996 Ford Taurus LX 130,000 Sold 1985 300TD Still 225,000 Sold 2016 Ford Fusion 24,900
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#4
08-02-2013, 05:55 PM
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Quote:
__________________
Cheers! Scott McPhee 1987 300D
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#5
08-02-2013, 05:57 PM
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Quote:
It's thick-walled polyurethane clear line now.
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Cheers! Scott McPhee 1987 300D
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#6
08-02-2013, 06:13 PM
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Fuel flow thru the IP keeps it cool. DO NOT pinch off the return line!
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#7
08-02-2013, 06:41 PM
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Quote:
__________________
Cheers! Scott McPhee 1987 300D
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#9
08-02-2013, 09:28 PM
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Several Years a go there was part of a thread on Fuel Supply/Lift Pumps where I thought the Pumps were positive displacement Pumps.
I think it was Numbercruncher that cleared that up. If I remember it the Piston is pushed against spring tension and pumps that way when the Push Rod releases the Piston+Spring the Piston Going back under Spring tension also pump Fuel. If the Fuel Outlet in the Fuel Injection System was plugged of the Piston would push against the Spring Tension and the Fuel Pressure would hold the Piston+Spring in the compressed state until some thing relieves the Pressure. There are Fuel Injection Pumps out there that do not return Fuel. Simms inline Fuel Injection Pumps (as seen on some Ford Tractors) and a lot of the Caterpillar Fuel Injection Pumps don't have Fuel Returns on the Fuel Injection Pumps. But, they have Diaphragm type Fuel Pumps like the older Cars used to have. They also have an Air Bleed Screw you need to loosen to bleed the Air out when you get Air in the System.
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84 300D, 82 Volvo 244Gl Diesel
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