Date: Sun, 20 Jun 2004 20:42:55 -0700
Reply-To: Craig Oda <craigoda@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Craig Oda <craigoda@GMAIL.COM>
Subject: Re: cheap gauges from JC Whitney
In-Reply-To: <40D63234.60902@earthlink.net>
Content-Type: text/plain; charset=US-ASCII
Mark,
thanks for your response. I guess I'll go back to my original plan
and put the electronic pressure sender after the fuel pump, under the
van.
There are some other problems with my engine, but one reason I'm
looking at putting a fuel pressure gauge in is that the van will
sometimes die at idle. I have an automatic transmission.
I'm not sure how the pressure regulator works. Maybe I should just
buy a new regulator? It's probably 20 years old anyway...
-- Craig
On Sun, 20 Jun 2004 17:56:20 -0700, mark drillock
<drillock@earthlink.net> wrote:
>
> The proper place for the pressure gauge is between the fuel pump and the
> pressure regulator. The only thing 'after' the pressure regulator is the
> return line to the tank and that will have close to zero pressure.
>
> The fuel comes from the pump to a "T" connector near the distributor.
> From there it branches off with one leg to the left head and one to the
> right. At each head is a "cigar tube" where the 2 injectors connect on
> each side. The fuel goes in one end of the tube and out the other. Both
> outputs return to the center of the engine where the pressure regulator
> is. Each line connects to one of 2 pipes on the regulator high pressure
> side. The regulator constantly bleeds fuel pressure out into the
> return line to the tank. By this method the fuel pressure is the same
> all the way from the pump output to the regulator. The pump is always
> trying to put out more pressure than the regulator will allow. There is
> thus always fuel being returned to the tank from the regulator pressure
> relief mechanism.
>
> Mark
>
>
>
> Craig Oda wrote:
>
> >Todd,
> >
> >
> >good point. I'll put the fuel pressure gauge after the pressure
> >regulator. You're right. I need to get the same pressure that is
> >going to injectors, especially since I suspect that the pressure
> >regulator might be flaky.
> >
> >Regards,
> >Craig
> >
> >
> >On Sun, 20 Jun 2004 11:02:57 -0700, Todd Last <rubatoguy@comcast.net> wrote:
> >
> >
> >>I would think that they would be fine assuming that they are accurate.
> >>It would be interesting to test them alongside an "expensive" gauge to
> >>see if there is any difference.
> >>One thing I have noticed in less accurate gauges is that they play with
> >>the dial scale and pointer width to conceal the margin of error.
> >>
> >>In anycase, I'm wondering if a better placement for the fuel pressure
> >>gauge would be AFTER the fuel pressure regulator.
> >>If you put it right after the fuel pump, you'd only see the delivered
> >>pressure from the pump, not the actual pressure the injectors are seeing.
> >>right? And you never want to use a mechanical pressure gauge in the
> >>passenger compartment for fuel pressure. (because of what would happen
> >>if it leaked)
> >>
> >>
>
>
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