lift pump
#1
10-24-2009, 06:14 AM
#3
10-25-2009, 06:24 PM
Diesel Bomber
that'd be pressure specs; not the flow rate... but i do have to ask why does flow rate really matter? in order to have pressure there has to be a restriction, or an abundant supply. as long as there's pressure then you have plenty of potential for flow; i say potential b/c the pump uses the return line as it's restriction. if there is a restriction before the pump then you won't get the same flow to the pump. best way to describe the flow rate of the stock lift pump... too little for anything but a stock truck.
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if i did the math correctly; when bobby posted the fuel system manual the spec for the lift pump is .70 quarts in 30 seconds at cranking speed. which is 2.8 quarts per 2 minuets; or 84 gal/per hr.
---AutoMerged DoublePost---
if i did the math correctly; when bobby posted the fuel system manual the spec for the lift pump is .70 quarts in 30 seconds at cranking speed. which is 2.8 quarts per 2 minuets; or 84 gal/per hr.
Last edited by tower_ofpower; 10-25-2009 at 06:24 PM. Reason: Automerged Doublepost
#4
10-25-2009, 06:34 PM
#5
10-25-2009, 07:41 PM
yer talkin the mechanical pump driven off a cam lobe????
flow rate is important but its expensive to measure flow, the easiest way is to measure the pressure as pressure is simple the resistance to flow....................easier put is to take an open ended garden hose and turn the valve 100% open.............the water will flow like crazy in GPM but will have little pressure since there is no resistance to flow........then take yer thumb and place it over the end of the hose, this will create resistance and the flow rate will drop (GPM) and the pressure will increase
clear as mudd now
bottom line get a fuel psi gauge and monitor that......if the pressure gets low during hard acceleration then yer pump or system has issues and needs attention
flow rate is important but its expensive to measure flow, the easiest way is to measure the pressure as pressure is simple the resistance to flow....................easier put is to take an open ended garden hose and turn the valve 100% open.............the water will flow like crazy in GPM but will have little pressure since there is no resistance to flow........then take yer thumb and place it over the end of the hose, this will create resistance and the flow rate will drop (GPM) and the pressure will increase
clear as mudd now
bottom line get a fuel psi gauge and monitor that......if the pressure gets low during hard acceleration then yer pump or system has issues and needs attention
#6
10-25-2009, 08:23 PM
0.75L (max) / 30 sec
3-5psi
That is straight from teh factory service manual. You pump will take around 15psi to the inlet w/o issue. Runs better like that too.
Here is what the FSM has to say about the fuel system
https://www.dieselbombers.com/1st-ge...el-system.html
The spec I found was at teh bottom of the last page. I would download it and print it out, easier to read like that.
3-5psi
That is straight from teh factory service manual. You pump will take around 15psi to the inlet w/o issue. Runs better like that too.
Here is what the FSM has to say about the fuel system
https://www.dieselbombers.com/1st-ge...el-system.html
The spec I found was at teh bottom of the last page. I would download it and print it out, easier to read like that.
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