Vacuum Pump questions...
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Vacuum Pump questions...
It's a 91 f150. It just got out of the shop because I couldn't diagnose the ignition problem. The mechanic said everything looks ok but the vacuum pump may go out soon. I did some price research and its about a $200 part. What does this part actually do? Is the truck going to completely crap out when I'm driving if this thing goes out? If it's something I can live without can I buy a shorter belt and just bypass the pump? Thanks in advance.
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Im not totally sure what the vacume pump does but i know that it pumps air into the intake manafold, the exhaust manifold or head (depending on your vehicle), and into the cat. The purpose of this is to make the truck apear as if its running cleaner. i have not heard of any options of a air pump delete kit or anything like that but i would keep looking. I dont know if getting rid of that will screw up the air to fuel ratios because, depending on the vehicle, if it pumps the air into the head then there may be less air, in the air to fuel mixture, if you were to get rid of the pump.
I.6.O.D
I.6.O.D
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There ain't no vacuum pump on that F150, what ya'll got there is an AIR pump, which does absolutely nothing for the engine's proper operation, but it does help reduce emissions when cold by blowing air in the cats. So really as long as the pump don't physically seize it's all good regardless of how much air it actually moves, and if it does show signs of seizing up just use a shorter belt if you can (may have to route it differently tho) and bypass it. Do you have emissions testing in your area?
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Yes I do have emissions testing in my area. My mechanic that I use I have used him for years and is one of the best in Springfield, IL. He said it was a vacuum pump...he said if it goes out my power steering or something may go out. And when I search on autozone.com under 91 f150 a vacuum pump comes up so there obviously is one on the truck.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Springfield has emission testing? I never knew downstate IL had areas with testing, I'll stick to the Champaign area if that is the case. I'll second what the others are saying, there is no vacuum pump on your F150.
EDIT: I stand corrected, there is a vacuum pump listed at Autozone for a 1991 F-150 w/5.0L engine! I wonder where it's located on the engine? Maybe it is a misprint and it's actually for a larger truck with 7.3L diesel?
EDIT: I stand corrected, there is a vacuum pump listed at Autozone for a 1991 F-150 w/5.0L engine! I wonder where it's located on the engine? Maybe it is a misprint and it's actually for a larger truck with 7.3L diesel?
Postmaster
Joined: Aug 2005
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From: Cleveland, TN
Springfield has emission testing? I never knew downstate IL had areas with testing, I'll stick to the Champaign area if that is the case. I'll second what the others are saying, there is no vacuum pump on your F150.
EDIT: I stand corrected, there is a vacuum pump listed at Autozone for a 1991 F-150 w/5.0L engine! I wonder where it's located on the engine? Maybe it is a misprint and it's actually for a larger truck with 7.3L diesel?
EDIT: I stand corrected, there is a vacuum pump listed at Autozone for a 1991 F-150 w/5.0L engine! I wonder where it's located on the engine? Maybe it is a misprint and it's actually for a larger truck with 7.3L diesel?
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Well I'm going to take your words for it and say there is not vacuum pump. I'm a newbie to this old truck thing...I got it cheap and gonna use it for a work truck so I'm relying on all of you for your education and useful info 
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Yes I do have emissions testing in my area. My mechanic that I use I have used him for years and is one of the best in Springfield, IL. He said it was a vacuum pump...he said if it goes out my power steering or something may go out. And when I search on autozone.com under 91 f150 a vacuum pump comes up so there obviously is one on the truck.
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From: Tallahassee, Fl.
Cheaper at Advance...
Vacuum Pump by BWD - Part VDV20 - Advance Auto Parts
Doesn't show one for my '95 with the same engine.
Vacuum Pump by BWD - Part VDV20 - Advance Auto Parts
Doesn't show one for my '95 with the same engine.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
I thought the same thing so I went to Advance Auto and Oreilly both of them list the pump too. Oreilly has a good listing by application of what the pump fits, no oil-burners listed...
Pic:
I hope someone can chime in and point out why it is used on gas engines from the 1987-1993 range and where it fits.
Pic:
I hope someone can chime in and point out why it is used on gas engines from the 1987-1993 range and where it fits.
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Subford, but your '55 ain't no EFI - I do agree with you tho, vacuum pumps are the sign of coolness in a truck 
That's the exact same thing that I have in my diesel, runs the brakes (well it used to) and the HVAC system. Same pump lives in Dodge and GM diesels (Hummers included), as well as apparently in some big trailers - there are slight variations in shaft length and diameter, but the essentially it's all the same thing. Never ever have I seen one of those critters in a fuel-injected Ford gasser...
I thought the same thing so I went to Advance Auto and Oreilly both of them list the pump too. Oreilly has a good listing by application of what the pump fits, no oil-burners listed...
Pic:
I hope someone can chime in and point out why it is used on gas engines from the 1987-1993 range and where it fits.
Pic:
I hope someone can chime in and point out why it is used on gas engines from the 1987-1993 range and where it fits.
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