Hi this is my first thread here and Ive got a long question,
My 92 had the injector pump fail the other day and I had it rebuilt at a local shop however when I got it back it would start sucking air after about 5 miles. So I took it back to them and they concluded that the key that is splined to the lift pump cam lobe had sheared and thus no longer able to pump fuel so they covered the hole and installed a MR gasket 12D from Oriely's. I got the truck back and the part about sucking air ceased. But then the fuel filther light would come on so I took the filther off to check for trash and found none. So I put the filther back on and go to crank the truck and the elec pump doesnt do anything but get hot & no more pumping. this has happend 2 times now. and I'm wondering is there a better electric pump for this engine or do I need to think about fixing the cam?
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1992 F250 XLT 7.3L ATS 093 was E4OD now ZF5
3" down pipe to 4" straight pipe
3.55 12" LUK SMF
265,000miles
Also if the lift pump cam key sheared, which I have never seen, the cam gear should be falling off soon.
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91 F350 crew cab 4x4 7.3 ats and intercooled with cut down 2000 ps cooler, bigger turbo comp,head studs, torque cam, coated rockers , balanced. very good power.
pyro,boost and all stock guages ignored with mechanical real ones
Fugitive sandrail. type 4 2840 turbo fi, lots of fun
O.k. I got the pump issue fixed, I bought a Stewart Warner 12volt and mounted it back by the tank. thats been 2 months and 5000 miles ago and nothings gone wrong since. But for curiousity the cam lobe that drives the fuel pump is cast on to the camshaft and is right behind the cam gear right? or is it floated with a keyway like the guy at the injector pump shop told me?
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1992 F250 XLT 7.3L ATS 093 was E4OD now ZF5
3" down pipe to 4" straight pipe
3.55 12" LUK SMF
265,000miles
Where would one install an electric pump on one of these?
Mines halfway down the frame rail with an oil-filter header just after it to pre-filter and a ball valve on both sides for cleaner filter changes. I've got a Holley which is a POS, I'm on my second one in this van. My next pump will be a Mallory 4110 with a 1.5K 50W resistor to slow it down a bit. To mount my pump I welded a flat plate to the frame. One could drill and mount an angle bracket or bolt through the frame with some spacers. Welding was easier, I pre-drilled on the drill press and just welded it to the inside of the frame rail to "box" the frame.
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1986 F350 Crew Cab 2wd SRW. 1991 7.3 IDI, T-19 4spd Sterling 10.25 3.55, 12" HD clutch. A Banks waste gated turbo. 5" cut down Peterbilt stack. Midwest rebuilt IP turned up. AC Delco 6.5 GM 12V GP's, working great. Running W85 high performance zero-gel diesel! D60 front conversion, 4wd conversion, dually conversion, and steel flatbed conversion now underway. Man those frame rivets are a pain!
1966 Porsche 911. 1983 911 SC engine with modified Zenith carbs, headers, 911S brakes, custom fuel rails, MSD 6al box with timing computer, 1974 IROC body kit. 1850lbs, 200rwhp, total blast to drive.
Yes the electric is good for priming. I run fuel blends and change filters often so it makes it really easy to get started after a filter change.
My Holley is 6-8 PSI and it has a built in relief. I've never measured the pressure at the filter head so I don't know if it's hitting the relief or not. I would assume that it is.
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1986 F350 Crew Cab 2wd SRW. 1991 7.3 IDI, T-19 4spd Sterling 10.25 3.55, 12" HD clutch. A Banks waste gated turbo. 5" cut down Peterbilt stack. Midwest rebuilt IP turned up. AC Delco 6.5 GM 12V GP's, working great. Running W85 high performance zero-gel diesel! D60 front conversion, 4wd conversion, dually conversion, and steel flatbed conversion now underway. Man those frame rivets are a pain!
1966 Porsche 911. 1983 911 SC engine with modified Zenith carbs, headers, 911S brakes, custom fuel rails, MSD 6al box with timing computer, 1974 IROC body kit. 1850lbs, 200rwhp, total blast to drive.
The eccentric is pressed onto the cam and there is probably nothing wrong with it. if that key slipped your cam gear would have fallen off. most likely the mechanical pump was just bad.
that pressure is perfect.
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91 F350 crew cab 4x4 7.3 ats and intercooled with cut down 2000 ps cooler, bigger turbo comp,head studs, torque cam, coated rockers , balanced. very good power.
pyro,boost and all stock guages ignored with mechanical real ones
Fugitive sandrail. type 4 2840 turbo fi, lots of fun
Good thats what I wanted to know about the cam lobe, because the guy at the injection shop was trying to tell me that if the "keyway" on the cam had sheared and that it was not spinning with the camshaft all the time, that it was slipping and thus not pumping enough fuel. The service manager at the local International house told me that the lobe was cast to the cam just like the intake/exhaust and that the key thing was wrong. I wouldnt know Ive never torn into an IDI to see it in person. If i could id prefer to go back to the mechanical pump.
__________________
1992 F250 XLT 7.3L ATS 093 was E4OD now ZF5
3" down pipe to 4" straight pipe
3.55 12" LUK SMF
265,000miles
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