Hi All. 2 questions.
What should the fuel pressure be at the filter test port with the engine running?
Out of nowhere my engine started surging at idle, no leaks, timing right, fuel pressure at 3 psi running, at the filter. Too low?.thanks
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73 f350 flatbed, 7.3 diesel ,np 435 trans ,spicer 3 speed aux, dana 70u axle. beefed up overload springs. crane . dual tanks, single 3 in exhaust stack.
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89 7.3 crewcab w/ Banks Sidewinder Wastegated Turbo. 4 inch straight piped. BTS E4OD trans with 2 extra gallons of ATF in a Mag Hy-Tec pan. Gear Vendors. Rodney Red custom aluminum radiator. Moose Pump with "G' injectors. Motor rebuilt with new after market ported heads. Mahle low comp pistons milled 12 thousands. Balanced to 1/4 to 1/3 gram. Lined bored. Block decked and sleeved on all 8. Shimed oil pump for higher pressure. Intake and exhaust logs ported too. Hypermax in shop waiting to be installed later....
Do a pressure and flow test of the fuel pump at the Schrader valve on the filter header (FSS- fuel shutoff solenoid disconnected on IP). Remove the tire valve core and hook a hose and pressure guage on it should see 4-6 psi when cranking. Then do a fuel quantity test same place, should see 1/3 pint in 10 seconds of engine cranking, route fuel to a suitable container with a hose.
If there is a problem with the lift pump and you are changing it, ensure the new pump comes with instructions as to correct installation procedure if it is the newer model pump with the almost straight arm.
__________________ http://photos.thedieselstop.com/show...0/ppuser/28329
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93 has 160K+, it's basically a stock truck with all the Ford options, just no disc player.
Toys: 26'Jayco FK TT, 18'Sylvan Pro Fish.
I'm running an electric pump, When running, and I pinch off the return at the filter, pressure goes up to 6 psi and the engine runs only slightly better. The fuel pressure has allways been around 3 psi. I found a referance to pressure elsewhere in this forum that says 1-2 psi at the shrader valve. so I,m a bit confused. I suppose I should be a little more clear as to how it runs. There are no issues off idle and hi speed. it will idle smooth for a few seconds the it will jump a few hundred rpms for a split second then go down again for a few more. this is not a rythemic type of action. sometimes it will stay at the higher speed for several seconds then drop down to idle again. I read about a slipring in the govorner that breaks up but found no black particals inside. Could I simply be having govorner problems with the ip now
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73 f350 flatbed, 7.3 diesel ,np 435 trans ,spicer 3 speed aux, dana 70u axle. beefed up overload springs. crane . dual tanks, single 3 in exhaust stack.
Remember that the return to #1 injector and the inlet to the IP are free flowing all the time.... the IP rally only needs 2 psi to work correctly. The extra pressure and flow are used for cooling the IP. Your rythmic surge could be air in the system..
__________________ http://photos.thedieselstop.com/show...0/ppuser/28329
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93 has 160K+, it's basically a stock truck with all the Ford options, just no disc player.
Toys: 26'Jayco FK TT, 18'Sylvan Pro Fish.
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