After Market Fuel Pumps
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Joined: Aug 2004
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From: In front of the black cloud, MO
Yeah, I wasn't thinking about it still having the SD fuel lines... Who knows what'll happen. I don't know if my return line was just too small or if the VP44 was the restriction, but it built enough pressure within 30 seconds to blow the filter lid. My pump was a Bosch in-line designed for fuel injection, that I had laying around, left over from the Mustang build up.
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Joined: May 2005
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Blowing your filter lid doesn't make sense. Your return line must be restricted or something. When a VP44 is tested on a test stand, the diesel flow through it is quite high. I doubt that an electric fuel injection supply pump would have the same volume. Something isn't right here.
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Joined: Mar 2002
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From: OWEGO, NY
Superduty,
Back to the inlet pressures of the VP44......I understand that the VP44 is a flow through injection pump.......but your question is how i measured 20 psi at the inlet of the VP44?
On my 01 I built my own fuel system. I had bottom suction feed off of the tank, feeding into a PE engineering Electric fuel pump (with an inline filter in before the pump), with -8 line going into my fuel filter housing, then out of the bottom of my fuel filter housing, with -6 , into my "t" where I was reading my fuel pressure at, then directlyu into the injection pump. At Idle my gauge would read 19 psi.....and at WOT I could drag it down to 17 psi.
I am no expert..or a fuel injection guy, but you are going to see some sort of pressure at the inlet. If the VP44 is a true flow thought pump it would be 0.....but it just must not be able to move enough fuel (return) to the tank. As muzzy said....it is more about volume than pressure to keep the pump cool.
Bill
Back to the inlet pressures of the VP44......I understand that the VP44 is a flow through injection pump.......but your question is how i measured 20 psi at the inlet of the VP44?
On my 01 I built my own fuel system. I had bottom suction feed off of the tank, feeding into a PE engineering Electric fuel pump (with an inline filter in before the pump), with -8 line going into my fuel filter housing, then out of the bottom of my fuel filter housing, with -6 , into my "t" where I was reading my fuel pressure at, then directlyu into the injection pump. At Idle my gauge would read 19 psi.....and at WOT I could drag it down to 17 psi.
I am no expert..or a fuel injection guy, but you are going to see some sort of pressure at the inlet. If the VP44 is a true flow thought pump it would be 0.....but it just must not be able to move enough fuel (return) to the tank. As muzzy said....it is more about volume than pressure to keep the pump cool.
Bill
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"but you are going to see some sort of pressure at the inlet. If the VP44 is a true flow thought pump it would be 0.....but it just must not be able to move enough fuel (return) to the tank. As muzzy said....it is more about volume than pressure to keep the pump cool."
I agree on both counts. The next time I am talking with a fuel shop I am going to ask them what the flow rate and back pressure is when testing a VP44 on the bench.
I agree on both counts. The next time I am talking with a fuel shop I am going to ask them what the flow rate and back pressure is when testing a VP44 on the bench.
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