petrol pump v8 110

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I

Idris

Guest
If I have understood the system correctly the pump is designed to provide a
constant flow with a return to the tank.

When the previous owners had an lpg conversion fitted a solenoid operated
valve was fitted to the feed pipe.

When on lpg the solenoid closes the feed pipe so the pump can not create a
flow.

Would this be the reason a new petrol pump has failed after just a few
hundered miles?

Gerald


 
Idris wrote:

> If I have understood the system correctly the pump is designed to provide
> a
> constant flow with a return to the tank.
>
> When the previous owners had an lpg conversion fitted a solenoid operated
> valve was fitted to the feed pipe.
>
> When on lpg the solenoid closes the feed pipe so the pump can not create a
> flow.
>
> Would this be the reason a new petrol pump has failed after just a few
> hundered miles?
>
> Gerald

Yes. (If I understand correctly what you are describing) When on LPG the
pump should be switched off, I would have thought - if it is, this is not
the reason).
JD
JD
 

"JD" <[email protected]> wrote in message
news:[email protected]...
> Idris wrote:
>
> > If I have understood the system correctly the pump is designed to
provide
> > a
> > constant flow with a return to the tank.
> >
> > When the previous owners had an lpg conversion fitted a solenoid
operated
> > valve was fitted to the feed pipe.
> >
> > When on lpg the solenoid closes the feed pipe so the pump can not create
a
> > flow.
> >
> > Would this be the reason a new petrol pump has failed after just a few
> > hundered miles?
> >
> > Gerald
>
> Yes. (If I understand correctly what you are describing) When on LPG the
> pump should be switched off, I would have thought - if it is, this is not
> the reason).
> JD
>

Maybe the signal has a 'live' output from the controller, if so they could
have fitted a relay to de-energise the pump supply when on gas.

Martin


 

"Oily" <[email protected]> wrote in message
news:[email protected]...
>
> "JD" <[email protected]> wrote in message
> news:[email protected]...
> > Idris wrote:
> >
> > > If I have understood the system correctly the pump is designed to
> provide
> > > a
> > > constant flow with a return to the tank.
> > >
> > > When the previous owners had an lpg conversion fitted a solenoid
> operated
> > > valve was fitted to the feed pipe.
> > >
> > > When on lpg the solenoid closes the feed pipe so the pump can not
create
> a
> > > flow.
> > >
> > > Would this be the reason a new petrol pump has failed after just a few
> > > hundered miles?
> > >
> > > Gerald
> >
> > Yes. (If I understand correctly what you are describing) When on LPG the
> > pump should be switched off, I would have thought - if it is, this is
not
> > the reason).
> > JD
> >
>
> Maybe the signal has a 'live' output from the controller, if so they could
> have fitted a relay to de-energise the pump supply when on gas.
>
> Martin
>
>
Thanks thats much as I thought.
Currently the pump is live both on petrol and on LPG and hence probable
cause of failure.

Gerald


 
On Mon, 16 Oct 2006 21:54:01 +0100, "Idris" <[email protected]>
wrote:

>Thanks thats much as I thought.
>Currently the pump is live both on petrol and on LPG and hence probable
>cause of failure.

Tis on mine too and that hasn't failed yet. I thought it was just a
centrifugal pump so assumed stalling it would cause no problem. The
benefit of having a pressure in the petrol feed line is to quickly
fill the float bowls. I also thought the re circulation was to cool
the carbs.

AJH

 

"AJH" <[email protected]> wrote in message
news:[email protected]...
> On Mon, 16 Oct 2006 21:54:01 +0100, "Idris" <[email protected]>
> wrote:
>
> >Thanks thats much as I thought.
> >Currently the pump is live both on petrol and on LPG and hence probable
> >cause of failure.
>
> Tis on mine too and that hasn't failed yet. I thought it was just a
> centrifugal pump so assumed stalling it would cause no problem. The
> benefit of having a pressure in the petrol feed line is to quickly
> fill the float bowls. I also thought the re circulation was to cool
> the carbs.
>
> AJH
>

I seem to remember seeing reports of the pump failing if you run with an
empty tank as the pump relies on the petrol to cool it. Disabling it hen
the lpg is on seems to be a sensible move.
--
Bob Miller
1990 ex-RAF 110 3.5 V8 17KJ83
1967 3/4 ton Sankey 09ES17


 
On Tue, 17 Oct 2006 13:30:55 +0100, "Bob Miller"
<[email protected]> wrote:

>I seem to remember seeing reports of the pump failing if you run with an
>empty tank as the pump relies on the petrol to cool it. Disabling it hen
>the lpg is on seems to be a sensible move.

I would expect it to be more a problem of the bearings running dry, I
keep petrol in the tank, just in case. I sometimes have problems with
hot starts on lpg.

It looks easy to isolate the pump as there is a connector block on the
top of the bulk head, this could be replaced by a solenoid activated
off the lpg switch.

AJH

 
On or around Wed, 18 Oct 2006 09:54:05 +0100, AJH
<[email protected]> enlightened us thusly:

>On Tue, 17 Oct 2006 13:30:55 +0100, "Bob Miller"
><[email protected]> wrote:
>
>>I seem to remember seeing reports of the pump failing if you run with an
>>empty tank as the pump relies on the petrol to cool it. Disabling it hen
>>the lpg is on seems to be a sensible move.
>
>I would expect it to be more a problem of the bearings running dry, I
>keep petrol in the tank, just in case. I sometimes have problems with
>hot starts on lpg.
>
>It looks easy to isolate the pump as there is a connector block on the
>top of the bulk head, this could be replaced by a solenoid activated
>off the lpg switch.

If it's a continuous flow system, as per the rangies and discos with efi,
they have a return pipe I think from the accumulator thing (book's outside)
but anyway, the pump runs all the time and generates fuel under pressure in
the feed pipe, with the remainder going back to the tank. This kind of pump
can be left running - the normal way to convert the EFi ones is to interrupt
the injector signals.

However, some of the 110s had an SU type pump which only runs on demand. The
coninuos operation ones could have a solenoid valve in the supply to the
carbs, if the carb isn't part of the return circuit, which is unlikely.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Something there is that doesn't love a wall."
Robert Frost (1874-1963)
 

"Austin Shackles" <[email protected]> wrote in message
news:eek:[email protected]...
> On or around Wed, 18 Oct 2006 09:54:05 +0100, AJH
> <[email protected]> enlightened us thusly:
>
> >On Tue, 17 Oct 2006 13:30:55 +0100, "Bob Miller"
> ><[email protected]> wrote:
> >
> >>I seem to remember seeing reports of the pump failing if you run with an
> >>empty tank as the pump relies on the petrol to cool it. Disabling it
hen
> >>the lpg is on seems to be a sensible move.
> >
> >I would expect it to be more a problem of the bearings running dry, I
> >keep petrol in the tank, just in case. I sometimes have problems with
> >hot starts on lpg.
> >
> >It looks easy to isolate the pump as there is a connector block on the
> >top of the bulk head, this could be replaced by a solenoid activated
> >off the lpg switch.
>
> If it's a continuous flow system, as per the rangies and discos with efi,
> they have a return pipe I think from the accumulator thing (book's
outside)
> but anyway, the pump runs all the time and generates fuel under pressure
in
> the feed pipe, with the remainder going back to the tank. This kind of
pump
> can be left running - the normal way to convert the EFi ones is to
interrupt
> the injector signals.
>
> However, some of the 110s had an SU type pump which only runs on demand.
The
> coninuos operation ones could have a solenoid valve in the supply to the
> carbs, if the carb isn't part of the return circuit, which is unlikely.
> --
> Austin Shackles. www.ddol-las.net my opinions are just that
> "Something there is that doesn't love a wall."
> Robert Frost (1874-1963)

The solenoid currently stops the flow before any pipe branches so stops all
flow. Am trying to decide whether its best to put in an electrical relay to
ensure pump is only switched on when on petrol, or to move the solenoid
valve so that the return is allways open and a branch to the carbs is
solenoid controlled.

Gerald

Gerald


 
Idris wrote:

>
> The solenoid currently stops the flow before any pipe branches so stops all
> flow. Am trying to decide whether its best to put in an electrical relay to
> ensure pump is only switched on when on petrol, or to move the solenoid
> valve so that the return is allways open and a branch to the carbs is
> solenoid controlled.

Go for the option that turns the pump off - it's how we've always done
our installs and has never caused any problem.


--
EMB
 
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