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Old 01-31-2011, 06:12 PM   #1 (permalink)
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99 f250 diesel lift pump?

So Im looking at a 99 f250 with 7.3 and the guy i might get it from told me the lift pump and or the rail pump might be going bad. Anyone have any ideas how to test this and or how to replace? he said it needs to be done by a technician because the pumps need to be timed with the injectors?
Thank you all for your help
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Old 01-31-2011, 07:03 PM   #2 (permalink)
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the fuel pump is electric and mounted to the drivers side frame rail under the drivers door, there is nothing on a 1999 ford 7.3l that needs to be timed, the injectors are computer controlled, the hpop is driven by the cam gear but not timed to anything, it is a constant flow pump..

things to look out for on the early trucks are plugged fuel strainers in the tank, under cover harnesses working loose under the v/c's, oil pan dipstick adaptor coming loose, water pumps, fuel drain valves leaking, turbo uptubes leaking, and fuel injector o-rings/injectors...
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Old 01-31-2011, 07:13 PM   #3 (permalink)
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so is there not a rail pump and or a lift pump?
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Old 01-31-2011, 07:16 PM   #4 (permalink)
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technically no, but, the fuel pump is on the rail..
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Old 01-31-2011, 08:11 PM   #5 (permalink)
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If your stock fuel pump is going out its time to look at an AirDog 150, better filtration, better fuel pressure, and constant supply to your injectors.

PureFlow AirDog
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Old 02-01-2011, 08:04 PM   #6 (permalink)
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ditto what others said.

Injector O rings $80 a set (all 8 injectors)

rebuilt and upgraded injectors can be had for as little as a grand. If these have had water or any fuel additive containing alcohol run thru them then there's a chance you could be charged an extra $60-75 each on the core charge - plunger and barrels would be shot. That's about your biggest expense.

good used HPOP can be found for $150 or less

upgraded one (more flow = more power with proper tuning) can be had for $700

if you keep the stock fuel pump, you can find one for $100 or so used, they're ~300 new

or upgrade like was said.

other oil system issues are rail plugs which are #5 o ring boss, those are like $3 each to fix. End plugs are $14 each.

not really a lot of big expense there if it's just parts needing replaced.

Troubleshooting - need a 100 psi fuel injection style pressure gauge for the fuel system; and a 5000 psi hydraulic gauge and Port-a-Power to troubleshoot the HP oil system. Easy enough to do.

Get a scan tool too or software with Ford enhanced diagnostics; money very well spent. less than $300 and you can run all the tests a shop can run.
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Old 02-02-2011, 06:30 AM   #7 (permalink)
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Also find out if it is an early 99 or late. they put a 17 degree HPOP in the late ones. It supplies more oil for the injectors to fire and will be necessary if you upgrade.


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