Fuel pressure

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Doakes
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Fuel pressure

Postby Doakes » Sat Nov 29, 2014 2:31 pm

What is a good mechanical fuel pressure?
Thanks
Dave

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bruceh
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Postby bruceh » Sat Nov 29, 2014 9:21 pm

fuel injected or carb?

FI requires a high pressure fuel pump. Mine puts out about 25-30 psi.
Carb is much lower. Something like 4-6 psi.
Bruce Hill
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Doakes
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Joined: Sat Nov 13, 2004 8:27 am
Location: Indiana

Postby Doakes » Sun Nov 30, 2014 3:24 pm

I forgot to mention it was a fuel injected. That is about the pressure I have too. Thanks Bruce.
Dave

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captain_john
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Postby captain_john » Mon Dec 01, 2014 8:23 am

Fwiw...

I am seeing about 28 psi also.

Are you having problems Dave?

:? CJ
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Doakes
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Joined: Sat Nov 13, 2004 8:27 am
Location: Indiana

Postby Doakes » Tue Dec 02, 2014 7:55 pm

No real trouble just a high reading from Dynon SV. It was reading about 41 lbs. and we put another meter in the system and it was read about 29 lbs. So I figured it was the transducer and not a true value. I am not sure if I will put on the transducer or just leave it alone and understand the difference.
Thanks for all the help.
Dave

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Wicked Stick
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Postby Wicked Stick » Tue Dec 02, 2014 10:49 pm

Can it be adjusted in the software ?
Change the transducer ?

I occasionally get slightly high fuel pressure when the boost pump is on during take-off. (about 30), then it settles back down to about 25-26 after I shut off the boost pump.
Dave "WS" Rogers
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bullojm1
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Postby bullojm1 » Fri Dec 05, 2014 10:26 am

I ran into a similar issue with the VDO fuel pressure sensor. Normally my fuel pressure is between 25-30 psi. Earlier this year it would sneak up to 36+ PSI out of nowhere, as seen below.

Image

I swapped out the sensor and the issue was immediately cured. It was an interesting failure, because most sensors I have had issues with usually read on the low side. I would recommend fixing the issue. Although you could always do some corrective math in your head, the sensor will most likely continue to degrade over time. For such an inexpensive part, monitoring a vital part of your engine functionality, I would think it makes sense to get it right.
Mike Bullock
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Doakes
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Location: Indiana

Postby Doakes » Sat Dec 06, 2014 7:06 pm

Good thought Mike. It really would be best to fix the problem than allow it to degrade. If I let this go by, probably get into habit of letting other small things go and soon many are out of whack.
Dave


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