Fuel pressure & overflow valve pressure - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 01-08-2009, 11:11 AM Thread Starter
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Fuel pressure & overflow valve pressure

If you are maintaining 7 to 12 psi at pump inlet and overflow valve opens at 14 psi, how does IP return excess fuel for cooling purposes? Russ
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post #2 of 5 (permalink) Old 01-08-2009, 11:04 PM
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It doesn't... If the fuel pressure is below 14 PSI it will not open...



Here is the write up for the overflow...
http://mopar.mopar1973man.com/tips/c...flow-valve.htm

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #3 of 5 (permalink) Old 01-09-2009, 12:28 AM Thread Starter
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Michael, great writeup. 2 questions though: 1: If the LP never delivers 14psi, wouldn't one run the risk of overheating the IP? I realize the ECM will throw a code if this happens, but I'm wondering why it doesn't happen more then? 2:Where do you get the banjo bolt with test port in it? I tried the dealer with no luck. Thanx for the help. Russ

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post #4 of 5 (permalink) Old 01-09-2009, 02:03 PM
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Quote:
Originally Posted by Deeslfxr View Post
Michael, great writeup. 2 questions though:

1: If the LP never delivers 14psi, wouldn't one run the risk of overheating the IP? I realize the ECM will throw a code if this happens, but I'm wondering why it doesn't happen more then?

Because there is a second return from the fuel rail at the back of the head.. This provides most of the return flow. The overflow is to keep the pressure from getting to high.



2:Where do you get the banjo bolt with test port in it? I tried the dealer with no luck. Thanx for the help. Russ
There banjo bolt can be purchased at Geno's Garage... The other place that sold them was Cummins. (Campaign Pump #4090046)

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #5 of 5 (permalink) Old 01-09-2009, 11:35 PM Thread Starter
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OK, that makes sense. Thanx Mike for all the info!! Russ
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