I am hooking up a brake vacuum pump I got out of a 84 f250 w/diesel. To use for something totally different from it's OEM designation. There are three wires, two red and one black.I need to know what wires go where (ie. red to positive) to make it work. Your help will be much appreciated.
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It is fuse number 28 in the Interior fuse box. It powers up lots of other things here is the list with the vacuum pump highlighted. Fuse #28-10A Brake Shift Interlock, DRL Relay Coil, Speed Control Module, Backup Lamps, Trailer Tow Backup Lamp Relay Coil, Electronic Shift On The Fly Hub Lock Solenoid, Vacuum Pump Motor
assuming dsl means diesel...these engines are not capable of creating vacuum to driveyour power brakes, they use an external source of vacuum, called a vacuum pump. they are either belt driven or electrical...given your age i would say belt driven...
If your model has a Vacuum Reserve cannister, its probably rusted out on the bottom. This part use to look like a Coffee can and has a Vacuum line to it. (Plastic would have been a better material.)
If that is not the problem, you can hook up a manual Vacuum Gauge tester to the line that hooks up to the pump on the engine. The line should hold Vacuum. If it does not, start backtracking all of the hose connections. Eventually you will find a line that does not hold Vacuum. It could even go to a Power brake booster.
I had bought a used Diesel truck and the guy paid big money for a new engine-driven Vacuum pump. I kept dropping my Cruise Control up hills. I used a Vacuum tester and found my Vacuum Reserve cannister was rusted. The seller paid $300+ for a part not needed.
could have a bad fuel transfer pump ( block mounted) or air getting into fuel system. This could be caused by a pin hole in the fuel lines ( supply or return) have someone crank it over for you while you press the shrader valeve on the fuel filter housing , see if you are getting fuel or air. Could also be an injection pump problem. Best thing would be to have it checked by a qualified diesel mechanic, as this could be caused by many different things. Kinda costly to throw parts at it on a guess without proper testing
could be vacuum pump. check for vacuum at line into booster (should be significant). if not ok, check for vacuum at pump to make sure it is not a line problem. if there is a check valve in the line, ensure it is working.
I had a problem with vacuum in my F250 diesel. It had a new vacuum pump but would kick out of cruise control every time the vacuum pressure dropped. It turned out to be the vacuum reserve cannister had holes in it.
Seems you reach a tipping point and then all the vacuum systems mess up. You might want to check the reserve cannister and any vacuum servo your 4x4 might have. You can check most of the vacuum stuff with the engine OFF using a vacuum pump. You could have a leaking vacuum pot operating the ductwork. Check your diesel vacuum pump for output and loose belts.
the problem is caused by either a failed power brake booster vacuum diaphram or a loss of vacuum to the booster, most likely the booster is defective, if this is a diesel then check the enginge driven vacuum pump.
check your vacuum storage unit or vaccum pump supply, remember diesel motors dont make vacuum like internal combustion gas powered engines do.. they have an auxilary vacuum motor and resovior to store vacuum to eliminate a lag time in vacuum supply...please rate my help..thanks...
Are you sure that your truck does not use a hydrovac unit rather than a traditional power brake booster unit? The hydrovac unit runs off a pump hydraulically. These go out and cause you to loose the power brake effect. They are very expensive to replace. You would be looking at about $450.00 to replace.