Vac pump failure - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 06-06-2011, 08:04 AM Thread Starter
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Vac pump failure

Pretty sure mine is dying a slow death- power brakes aren't working so hot and the AC blows out the defrost vents until RPM's come up. The pump is also making more noise and there is a buzzing under the dash that goes up/down with rpm.

Question- will a failing vac pump cause the e-brake light in the dash to come on? Since this problem started the e-brake light has been on also. At first it was intermittent, now it's on all the time.

97 F350 CCLB 4x4 PSD

Last edited by superduty4x4; 06-06-2011 at 08:08 AM.
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post #2 of 10 Old 06-06-2011, 03:30 PM
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vac pump in mine went out and made a wheezing sound when running, but they are pretty cheap to replace i paid maybe $80 or so at oreilly auto parts for mine

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
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Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
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Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #3 of 10 Old 06-07-2011, 06:38 AM
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not sure about the light, but when mine went out the shaft broke, fan ate the belt, bit of a mess and left me stranded. like 351 i got a replacement for about $90 at oreilly's.

i wasnt moving but 15 mph or so, if i had been pulling a trailer the pucker factor would have skyrocketed! id replece it. rent the pulley tool if you dont have one.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #4 of 10 Old 06-07-2011, 06:48 AM
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vac pump aint but 3 bolts i wanna say 7mm maybe, really easy i got one of those ratcheting box end wrenches made re install a hell of alot easier, my wife took my truck to work that day and mine ate the belt in the parking lot, so i put a new belt on it and it tore that to shreds in about 5 miles it took to get it home, they want a core charge too, and they swapped the pulley for me at the store

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #5 of 10 Old 06-07-2011, 06:53 AM
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good point. tehy let me use their tool at the store, they were too busy to do it for me. iirc, when i had the problem, a few people stated that out vac pumps were poorly designed. snapping shafts, etc.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
DB high torque starter
DIY 6637
Marinco Mod
DIY Electric fuel w/ wvo conversion

"A clean house is a sign of a mis-lead life."
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post #6 of 10 Old 06-07-2011, 07:10 AM
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mine just stopped spinning, and would stick, spun a bit though if forced, but belt just ate up when it stuck and i got the good one that cost $90 with a 2 year warrenty, ate half way and snapped chewed it up good, guys at oreilly were like holy cow, that belt is guaranteed never to do that, so i got another one free

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #7 of 10 Old 06-07-2011, 07:24 AM Thread Starter
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I swapped the pump from my wrecked truck last night, all is good in the neighborhood. The hardest part was getting the hose hooked back up! 3 10mm bolts, I used a box wrench and didn't have to fuss with the pulley at all.

97 F350 CCLB 4x4 PSD
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post #8 of 10 Old 06-07-2011, 07:33 AM
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i was close on the size, i used the cheap ratchet box wrench and it was glorious to get that thing, i wanna get a set of them here soon

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #9 of 10 Old 06-07-2011, 03:06 PM
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Yes, the low vacuum will throw on the "brake" light. On the driver's fenderwell, there is the vacuum manifold and a small canister hooked to it. The small canister is the low vacuum warning switch.

Bill

1996 F250 SC/SB 4X4 XLT
1997 F250 RC/SB 2WD project
2008 F350 CC/LB 4X4 DRW Lariat, 3" cow catcher mod
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I still say that those Dodge mirrors have as much business on a OBS Ford as yoga pants have on a fat chick...my .02
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post #10 of 10 Old 06-07-2011, 11:56 PM
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get new if you can, ive had two napa rebuilt ones and the first lasted 3 months and im on the 2nd now.

2002 crew cab short box 4x4 6 speed. 4 inch lift on 35's, Usual mods. Intake, Edge CTS, MBRP 4'' SS duals, regulated return and bosch fuel pump.
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