O'Reilly's Lift Pump
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Mountain Pass
Joined: Feb 2002
Posts: 243
Likes: 1
From: Houston USA
O'Reilly's Lift Pump
I'm working on a 1990 7.3 IDI which has a bad lift pump. I should have known better, but I bought a pump from O'Reilly, it is the "precision pump" brand. Anyways, I put the pump on, got the truck running, cut it off the night. The next day went to try to start and it wouldn't. Found out no fuel was coming from the pump, checked everything, found out the new lift pump isn't working. Pull it off and verified it is not pumping. I can't think of anything I could have done wrong. Anyone recommend another brand? Carter maybe? Thanks
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
I'm working on a 1990 7.3 IDI which has a bad lift pump. I should have known better, but I bought a pump from O'Reilly, it is the "precision pump" brand. Anyways, I put the pump on, got the truck running, cut it off the night. The next day went to try to start and it wouldn't. Found out no fuel was coming from the pump, checked everything, found out the new lift pump isn't working. Pull it off and verified it is not pumping. I can't think of anything I could have done wrong. Anyone recommend another brand? Carter maybe? Thanks
If you want a good pump, order a Duralift from that dude .... I can't remember his username. He's on FTE. Let me try and find him.
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
Can you post some numbers of the pump? flow? Pressure? I think most of those off the shelf pumps are not rated for Diesel and have only a few PSI.
If you want a good pump, order a Duralift from that dude .... I can't remember his username. He's on FTE. Let me try and find him.
If you want a good pump, order a Duralift from that dude .... I can't remember his username. He's on FTE. Let me try and find him.
Found him. "Genlightning"
https://www.ford-trucks.com/forums/1...l#post13719229
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
It's been a while since I've replaced my pump, but I think the IDI requires a 7-9 psi rating minimum. 5.75 is probably too low.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
The Carter and Airtex pumps for this truck spec out exactly the same. In fact the pic for the Carter pump on RockAuto is exactly the same as that for the Precision Pump on oreilleyauto.com . The pump is made to physically fit the engine, with an arm length designed to interface with the cam lobe. Given that it's built to this purpose, it's unlikely that it's not rated for diesel, or that it's underrated to supply the IP.
Most likely an "infant mortality" part. Looks like O'Reilly has the Spectra pump for this application, SP1010MP , for a few dollars more. Dunno about the pumps, but Spectra's fuel tanks have a good reputation. Might be worth asking to look at each one on the bench out of the box, and if it looks like the Spectra is a superior product, get them to exchange it for the difference in price.
Most likely an "infant mortality" part. Looks like O'Reilly has the Spectra pump for this application, SP1010MP , for a few dollars more. Dunno about the pumps, but Spectra's fuel tanks have a good reputation. Might be worth asking to look at each one on the bench out of the box, and if it looks like the Spectra is a superior product, get them to exchange it for the difference in price.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
I'm not familiar with Precision, doesn't sound promising with your experience.
You want to avoid Airtex anything and sadly I understand Airtex now owns Carter; so much for Carter.
I think 5-6lbs for a mechanical lift pump sounds normal to me.
You want to avoid Airtex anything and sadly I understand Airtex now owns Carter; so much for Carter.
I think 5-6lbs for a mechanical lift pump sounds normal to me.
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i ain't rite
Joined: Mar 2005
Posts: 65,505
Likes: 5,563
From: Marlboro Mental Hospital.
yea, 9 psi is kind of high. stock lift pump pressure is only 7 psi at filter head outlet with engine not running.
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Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
7.3L IDI Turbo Diesel Engine Performance Specifications
Engine Model A-185, A-166
Number of Cylinders 8
Configuration OHV V8
Bore 104.39 mm (4.11 inch)
Stroke 106.20 mm (4.18 inch)
Displacement 7.3 Liters (444 cu inch)
Crankshaft Rotation (Viewed from
Flywheel End of Engine) Counterclockwise
Compression Ratio 21.5:1
Firing Order 1-2-7-3-4-5-6-8
Idle Speed (No Load)* 650 rpm ± 50 rpm
Governor Speed (No Load) 3660 ± 50 rpm
Governor Speed (Full Load Rated) 3000 rpm
Timing (Dynamic) 8.5 ± 2 Degrees BTDC
Injection Pump Stanadyne DB-2
Injection Nozzle
Opening Pressure (New) 13,100 ± 517 kPa (1,900 ± 75 psi)
Opening Pressure (Minimum) 9,998 kPa (1,450 psi)
Crankcase Pressure-No Load (Maximum) 20 kPa (6 in-H2O) @ 3000 rpm
Fuel Pressure (Filter Inlet) 14 kPa (2 psi) @ idle
Fuel Pressure (Filter Outlet) 7 kPa (1 psi) @ 3000 rpm
Fuel Pump Suction 20 kPa (6 in. H2O) @ 3000 rpm
Fuel Return Line Pressure 14 kPa (2 psi) @ 3000 rpm
Valve Lifter 0
Valve Lash
Engine Lube Oil Pressure
Low Idle, Minimum 69 kPa (10 psi)
(Engine at Operating Temperature) 276-482 kPa (40-70 psi)
Crankcase Capacity (Without Filter) 8.5 L (9 qt.)
Crankcase Capacity (With Filter) 9.5 L (10 qt.)
Thermostat Opening Temperature 89°C (192°F)
* Manual transmission in NEUTRAL position. Automatic transmission in DRIVE position.
Engine Model A-185, A-166
Number of Cylinders 8
Configuration OHV V8
Bore 104.39 mm (4.11 inch)
Stroke 106.20 mm (4.18 inch)
Displacement 7.3 Liters (444 cu inch)
Crankshaft Rotation (Viewed from
Flywheel End of Engine) Counterclockwise
Compression Ratio 21.5:1
Firing Order 1-2-7-3-4-5-6-8
Idle Speed (No Load)* 650 rpm ± 50 rpm
Governor Speed (No Load) 3660 ± 50 rpm
Governor Speed (Full Load Rated) 3000 rpm
Timing (Dynamic) 8.5 ± 2 Degrees BTDC
Injection Pump Stanadyne DB-2
Injection Nozzle
Opening Pressure (New) 13,100 ± 517 kPa (1,900 ± 75 psi)
Opening Pressure (Minimum) 9,998 kPa (1,450 psi)
Crankcase Pressure-No Load (Maximum) 20 kPa (6 in-H2O) @ 3000 rpm
Fuel Pressure (Filter Inlet) 14 kPa (2 psi) @ idle
Fuel Pressure (Filter Outlet) 7 kPa (1 psi) @ 3000 rpm
Fuel Pump Suction 20 kPa (6 in. H2O) @ 3000 rpm
Fuel Return Line Pressure 14 kPa (2 psi) @ 3000 rpm
Valve Lifter 0
Valve Lash
Engine Lube Oil Pressure
Low Idle, Minimum 69 kPa (10 psi)
(Engine at Operating Temperature) 276-482 kPa (40-70 psi)
Crankcase Capacity (Without Filter) 8.5 L (9 qt.)
Crankcase Capacity (With Filter) 9.5 L (10 qt.)
Thermostat Opening Temperature 89°C (192°F)
* Manual transmission in NEUTRAL position. Automatic transmission in DRIVE position.
Lead Driver
Joined: Apr 2008
Posts: 6,938
Likes: 13
Above is right, no mechanical pump moves more than 3-4psi that ive ever seen except for like the holley red/blue mechanicals, and theyre like 5-6. 6psi is more or less the ideal pressure according to the pump stand.
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