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Sucking air/Losing prime
Replaced Schrader with nylon 1/8 NPT to 1/4 barb, disconnect IP plug, crank 10 sec into water bottle. Meets line measured 1/4 cup + 1/3 cup water (9 fl oz~1/3Pint). This was 2X what I got AFTER the filter so need to change filter, not pump:) Later- PROFG
- Post #38
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
I removed it when I broke the injector cap nipple it went to. Two part epoxy and wait an hour and no leak. Posted right after page update and post @ "ditching filter return line" :oops: Thought @ why pull Schrader to test LP volume and remembered maybe orifice in fitting. Just pulled it and...- PROFG
- Post #37
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
couple sentences lost here but probably not instructive and forgot anyhow Tire pump to filter vent, massive leak from bottom oring @ 7-8psi (same as 15"vacuum). Removed bottom of fuel filter to inspect, no dirt or water, oring fine, reinstalled. Tested LP flow into water bottle 10sec front...- PROFG
- Post #31
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Thanks Wes, only Ford would make a pump with no check valves. Will change design accordingly. When I started this reply posts by franklin2 and steve phillips above not visible. At last some discussion. Yes, I am fired up after stalling 5 miles from home today and needing AAA flatbed to get...- PROFG
- Post #29
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Ok, I will drop it after this. For last time, why does LP outlet and inlet check valves, assuming it has them, not prevent drainback to tank, or crankcase, in event of air leak downstream?? Adding check valve before LP, mainly because it is easier?, does not prevent tank draining thru LP...- PROFG
- Post #25
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Wes I have not taken one apart but fairly sure OEM LP has both inlet and outlet check valves or would not be much of a pump. Given that, how does parallel epump push flow back into LP? Epump also has outlet check so unless we think they are leaky, why do we need check valve before or after...- PROFG
- Post #24
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Seems main problem with air is leak locations do not leak fuel when shut down so pressurize the lines to find them. How much pressure can we apply to LP and IP without damage?- PROFG
- Post #23
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Wes I have not opened one up but fairly confident LP has check valves on inlet and outlet. If that's so, how can epump force flow thru LP outlet?? If epump ahead of LP, why does flow not pass thru LP, which would increase pressure on diaphragm? Have you seen this with items when installed...- PROFG
- Post #22
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Just a thought. How will epump cause flow thru LP output check valve while LP is also pumping? Unless we are worried about when(if) LP fails. Even then it will pumping unless supply shut off, which has not been mentioned yet. Really trying to get handle on failure modes since she died 5...- PROFG
- Post #18
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
An just in case this seems derailed, I plan to test a better way to prime a stock setup by running my 7.3 dry at 1/4 tank (showerheads not fixed yet). Might answer debate as to whether to open injector lines or not.- PROFG
- Post #17
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Wait a minute, no check in supply. How does LP work w/o a check valve at input and output?? As to a tight system, sure it's tight until it's not and then drainback so a stop at T prevents it. Don't plan to run both. Epump only large enough to prime and limp to safe location, almost any...- PROFG
- Post #16
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
I'm confused (not the first time ). So we are not worried about drainback thru supply but mainly the return? Then why need a check valve after LP? Or do we need both? A solenoid stop at return T and check valve after LP then to seal fuel in system, which might expand and blow off hose :eek...- PROFG
- Post #14
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Ok, so really need a stop valve before LP even if using parallel epump. This would stop LP from leaking to crankcase when shutoff or running with epump. Could be electric operated same circuit as epump. But, how does a check valve on LP inlet also prevent tank draining to crankcase unless...- PROFG
- Post #12
- Forum: 6.9L IH & 7.3L IDI Diesels
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Why 65psi max for dually rims?
For heavy or fast hauling I prefer to add air until the IR temp meter shows tires are not overheating (South side tires of course hotter during day). Would not have thrown 1/3 tread of new tire if started this earlier!!- PROFG
- Post #47
- Forum: 6.9L IH & 7.3L IDI Diesels
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Sucking air/Losing prime
Would after LP prevent leaky diaphragm to crankcase and be just as good for drainback? Will order 2 to start.- PROFG
- Post #10
- Forum: 6.9L IH & 7.3L IDI Diesels
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Carter P4070 Electric fuel pump failures.
Two quick related FYI. Looking at a sub $50 PWM controller for 10A pumps, will update with test data. And, considering real time MPG, how long can return flow be sent back to LP without overheating (maybe blue ice pack cooler)? My old (gas) tester had 1/10 G globe with fill/run/test valve but...- PROFG
- Post #32
- Forum: 6.9L IH & 7.3L IDI Diesels
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Why 65psi max for dually rims?
Side note from more than 6 freeway blowouts showing wheel strength (not dually or Ford but I think appropriate). Half ton '59 Chevy Apache 3200, stock wheels, 125psi, 1/2" rear axle travel till OL coil bound, freeway speeds, and 9400# on scales. Ran from Oregon with no problems until Indiana /...- PROFG
- Post #38
- Forum: 6.9L IH & 7.3L IDI Diesels
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Newbie in CT
I'm in Mystic area and thought 4" lift would allow engine lift w/o removing turbo parts etc. Would also need to check timing after I pop injectors since she is new to me. Have engine hoist good enough to lift spare engine out of bed but not sure if good enough to pull/install one. Already...- PROFG
- Post #7
- Forum: Introduction
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Newbie in CT
Hi mu2bdriver and saburai and thanks for welcome. Just got Teddy running again after chasing air leaks and 10amp hidden drain (fuse 6 fuel tank selector). Really should pull oil pan and check rod bearings but common wisdom indicates need to lift cab 4" to clear cross member and Banks downpipe...- PROFG
- Post #4
- Forum: Introduction
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Newbie in CT
Hi all. Just an old fart in tax hell with couple diesels. I am semi retired as they laughingly say with Navy heavy big diesel maintenance and later electronics training / repair and finally nuclear power plant maintenance. Back to the diesels, the one applicable to this forum is 93 F350 7.3...- PROFG
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- Replies: 6
- Forum: Introduction
