REFLECTOR:FW: Fuel Pressure Reads zero or low/intermittent

[Ronnie Brown]

That's not too good.  If it had been parked for 5-10 years, MAYBE!!  I'd say
JPI needs to provide higher quality sensors.

On the other hand, let me put in a good word for NAVAID.  I bought my Navaid
autopilot three years ago (too soon), but in any event, I just started
flying my Velocity last month.  I have 29 hours flown and got around to
trouble shooting the fact that the Navaid would not lock onto GPS course,
but would track a heading.  I called Navaid and he said he would ship me a
new GPS Coupler to fix the problem.  No hassle!!!  NOW THAT IS CUSTOMER
SERVICE!!!

Ronnie

----- Original Message -----
From: "Jay Yu" <jayyu@arczip.com>
To: <reflector@tvbf.org>
Sent: Wednesday, May 07, 2003 7:54 PM
Subject: REFLECTOR:FW: Fuel Pressure Reads zero or low/intermittent


> FYI.
>
> (I can't believe this! Mine was sitting since last August.)
>
> -----Original Message-----
> From: JPI Tech Support [mailto:jpitech@pacbell.net]
> Sent: Wednesday, May 07, 2003 11:30 AM
> To: Jay Yu
> Subject: Re: Fuel Pressure Reads zero or low/intermittent
>
>
> This is a follow-up from our phone conversation of earlier this morning.
We
> have reviewed you request and still think that replacing the Fuel Pressure
> sensor is the best resolution. The Part number of the Fuel Pressure sensor
> is 3060-17 and sells for $100.00 plus shipping.
>
> The main issue is in the sensor where you have a wiper are that after
> sitting for a pro-longed period will create an indentation in the pickup
in
> the sensor and would only read at lower temperature (or pressure), then
when
> the engine gets warmer, the wiper arm in the sensor would get stuck in
this
> depression and would not read higher. Another thing is to be certain not
to
> hard mount the sensor. It must be mounted on a flexible tube about six (6)
> inches in length (AEROQUIP 303 line) to protect the sensor from engine
> vibration which can damage the sensor's wiper arm and sending unit.
>
> Lastly, to check the instrument you simply disconnect the harness wire and
> the instrument head should read a high reading caused by an open circuit,
> then connect the wires and the reading on the instrument will read lower
due
> to the short.
>
> We hope this helps.
>
> Regards,
>
> JPI Product Support
>
>
> ----- Original Message -----
> From: "Jay Yu" <jayyu@arczip.com>
> To: <jpitech@pacbell.net>
> Cc: <jay.yu@bankofamerica.com>
> Sent: Tuesday, May 06, 2003 9:10 PM
> Subject: Fuel Pressure Reads zero or low/intermittent
>
>
> > Hi,
> >
> > I have a SlimLine fuel pressure instrument. Recently I saw 0 pressure
> right
> > after engine runup (before take off). It seems that when the engine is
> cold,
> > the reading is ok. Also when I removed the cowls, the reading was ok
too.
> > This seems to suggest that when the engine compartment is warm/hot. I
have
> a
> > reading problem. Does this make sense?
> >
> > This evening I measured the resistence between the two wires on the
> > connector on the instrument side. I noticed that when there was no fuel
> > pressure, the reading was 7.5 Ohms. When I turned on electric boost
pump,
> > the reading was 29.8 Ohms (I can normally get about 5 - 6 psi when the
> > electric boost pump is on). I also plugged the fuel pressure connector
to
> > oil pressure instrument. I noticed that the reading was 0 when there was
> no
> > fuel pressure and the reading was 15 psi when I turned on electric boost
> > pump.
> >
> > Based on these observations, can you tell if my fuel pressure instrument
> is
> > bad or the fuel pressure sender is bad? If it's the fuel pressure
sender,
> > could it be the temperature in engine compartment causing this problem?
> Also
> > can you give me some technical specification on the fuel pressure sender
> > such as the relationship between resistence and psi? On your web site I
> saw
> > the correlation between oil pressure and resistence such as 0 Ohm for 0
> psi,
> > 89 Ohms for 50 psi and 630 psi for open circuit.
> >
> > Thanks,
> >
> > Jinquan Yu
> >
> >
>
>
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