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Vacuum pump sensor placement
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DRR Trophy
posted
Installing A Racepak on dragster. we do not currently have a gauge for the vacuum pump. any suggestions?
 
Posts: 35 | Location: texas | Registered: February 22, 2008Reply With QuoteReport This Post
DRR Pro
Picture of Mike Beck
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If your valve covers are thick enough drill and tap for a 1/8" NPT fitting and run a short vacuum hose to the sensor.

Otherwise weld a fitting to a cover.

Or if intake is off drill and tap it for a fitting.
 
Posts: 1444 | Location: South River, NJ | Registered: June 19, 2007Reply With QuoteReport This Post
DRR Trophy
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If you don't want to drill any holes. Depending on the size of the fittings. If it's -12AN or smaller you can get a gauge port adapter to mount on the vacuum side. It has a female 1/8 NPT hole, that you can put a fitting in and go to the sensor. On pressure transducers, it's best to remotely mount them due to vibrations from the engine harmonics.

-12 Gauge Port Adapter
 
Posts: 3 | Location: Grand Junction, CO | Registered: October 13, 2012Reply With QuoteReport This Post
DRR Pro
Picture of BarneyB
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I always put them in the fuel pump block-off plate. Drill and tap an 1/8” npt hole but do NOT install the sensor in that hole. Install a push-to-connect fitting in the hole and mount the sensor in a rubber vibration mount or the sensor will not last long.



WiredTwoWin race car wiring



 
Posts: 2436 | Location: Wadsworth, Ohio | Registered: December 12, 2001Reply With QuoteReport This Post
DRR Sportsman
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X2 on fuel pump block off plate. I have push lock hose running to my gauge and when I installed the data logger I put a Y at the gauge and the vacuum sensor behind the dash by the logger.

This way there’s no hose to disconnect and remember to reconnect every time you take the valve covers off.
 
Posts: 712 | Location: Upstate NY | Registered: July 02, 2013Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
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quote:
Originally posted by 183N:
X2 on fuel pump block off plate. I have push lock hose running to my gauge and when I installed the data logger I put a Y at the gauge and the vacuum sensor behind the dash by the logger.

This way there’s no hose to disconnect and remember to reconnect every time you take the valve covers off.


x3. I've never understood why this isn't the most common location.


Tony Leonard
 
Posts: 3150 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR Pro
Picture of AlkyIROC
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I have a tee fitting on the inlet side of the pump and installed a gauge right there. Doesn't matter where in the system you're reading vacuum from. Valve cover, fuel pump block off plate or at the pump inlet, the vacuum reading will be all the same.


www.hardtail.com Stephen's Racing Page
Best ET: 9.029
Best MPH: 150.45

 
Posts: 1351 | Location: Calgary | Registered: June 06, 2001Reply With QuoteReport This Post



DRR Trophy
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We have a BBF with a belt drive so no fuel pump block off plate , i like the idea of the gauge adaptor for the hose plus it will be simple. thanks y'all,
 
Posts: 35 | Location: texas | Registered: February 22, 2008Reply With QuoteReport This Post
DRR Pro
Picture of AlkyIROC
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Actually, I have a double Tee at the pump inlet. One is for the gauge, the other is the relief valve. Same theory, it don't matter where the relief valve is in the system. If vacuum gets too low, the valve creates a leak in the system.


www.hardtail.com Stephen's Racing Page
Best ET: 9.029
Best MPH: 150.45

 
Posts: 1351 | Location: Calgary | Registered: June 06, 2001Reply With QuoteReport This Post
DRR Sportsman
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I have an aluminum oil pan. Right at pan rail level is a plug. Would this be an ok place for vacuum sensor? Alum Block / has no FP block off.
 
Posts: 212 | Location: Ohio | Registered: December 02, 2006Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by BarneyB:
Install a push-to-connect fitting in the hole and mount the sensor in a rubber vibration mount or the sensor will not last long.


Skip this step and you will be purchasing a $190 replacement sender.
 
Posts: 671 | Location: New Jersey | Registered: April 26, 2001Reply With QuoteReport This Post
DRR Trophy
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Thanks for that info, we did see it on the package also. Thanks for your help Greg my brother inlaw has been the one working with you on this set up.
 
Posts: 35 | Location: texas | Registered: February 22, 2008Reply With QuoteReport This Post
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