| [GMCnet] EFI fuel pressure gauges [message #164780] |
Sat, 31 March 2012 13:39  |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Senior Member |
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Hi,
Very disappointed with both Holley and Summit brand FP gauges. I used two prior to the EFI install and they both failed. Then bought a new one from Holley for the EFI and never really trusted it. Then I installed the Autometer FP sender into the EFI/EBL setup. Good readout from 18-20 lbs. Started the coach this morning and the Holley gauge read 30 PSI. Connected the EBL to the laptop and it still read 18-20 so the Holley gauge has failed once again. I'm thinking the pulsing of the FP regulator on the TBI must be killing the gauge. The Autometer sender for the EBL comes with a little damper deal that screws onto the sender. According to their tech guy it stops the pulsing and smooths out the readout. Never liked the Holley gauge in the engine compartment anyway so out it comes.
My rant for the day
Thanks
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
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| Re: [GMCnet] EFI fuel pressure gauges [message #164794 is a reply to message #164780] |
Sat, 31 March 2012 16:39  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Gary,
That's about the same as my experience. The fluctuating fuel pressure
destroyed 3 gauges, one of them to the point of pouring liquid gasoline
down onto the left rocker cover flange and thence the exhaust manifold.
Very lucky (?) that the coach didn't go up in flames.
Ken H.
On Sat, Mar 31, 2012 at 2:39 PM, Gary Worobec wrote:
> Hi,
> Very disappointed with both Holley and Summit brand FP gauges. I used two
> prior to the EFI install and they both failed. Then bought a new one from
> Holley for the EFI and never really trusted it. Then I installed the
> Autometer FP sender into the EFI/EBL setup. Good readout from 18-20 lbs.
> Started the coach this morning and the Holley gauge read 30 PSI. Connected
> the EBL to the laptop and it still read 18-20 so the Holley gauge has
> failed once again. I'm thinking the pulsing of the FP regulator on the TBI
> must be killing the gauge. The Autometer sender for the EBL comes with a
> little damper deal that screws onto the sender. According to their tech guy
> it stops the pulsing and smooths out the readout. Never liked the Holley
> gauge in the engine compartment anyway so out it comes.
>
> My rant for the day
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] EFI fuel pressure gauges [message #164864 is a reply to message #164780] |
Sun, 01 April 2012 07:39 |
jhb1
Messages: 303
Registered: February 2004
Karma: 0
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Senior Member |
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Hi Gary
I work in a fuel shop for aircraft engines we have experienced similar failures with really $$ gauges the only way to stop the failures is to install a line snubber. Which basically is a just a restrictor in the line if you are willing to build one I would try with a .020" between the source and gauge if you find the lag is too much increase the hole size .005 at a time. You can buy commercial ones for around 50-75$.
HTH
| Gary Worobec wrote on Sat, 31 March 2012 14:39 |
Hi,
Very disappointed with both Holley and Summit brand FP gauges. I used two prior to the EFI install and they both failed. Then bought a new one from Holley for the EFI and never really trusted it. Then I installed the Autometer FP sender into the EFI/EBL setup. Good readout from 18-20 lbs. Started the coach this morning and the Holley gauge read 30 PSI. Connected the EBL to the laptop and it still read 18-20 so the Holley gauge has failed once again. I'm thinking the pulsing of the FP regulator on the TBI must be killing the gauge. The Autometer sender for the EBL comes with a little damper deal that screws onto the sender. According to their tech guy it stops the pulsing and smooths out the readout. Never liked the Holley gauge in the engine compartment anyway so out it comes.
My rant for the day
Thanks
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
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John H. Bell
77 Royale; QuadBag,Manny OneTon,Honda EV4010, FITech
Montreal Qc.
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| Re: [GMCnet] EFI fuel pressure gauges [message #164882 is a reply to message #164780] |
Sun, 01 April 2012 09:54 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Gary,
I have a autometer sensor and didn't get this "damper deal that screws into the sender" or maybe it was already in there?
The readout on the EBL fluctuates about 1/2 lb but I'm thinking that's normal. I could add some more damping to the readout in the EBL.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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