Fuel pump/ and back firing

[tbwills]

I hooked a test light up to the power side of the fuel pump and it shows power to it, and cleaned the ground conetion, the pump still is not working, I'm assuming at this point that the pump is shot. I was able to get a little fuel into the carb and start it but it was back firing realy bad, would this just be the timing is off? If the distributor was off by 180 the car would'nt start at all would it? any advice is helpfull,
Thanks

[blake neilson]

If you are spraying fuel into the carb to get it to run, then the carb may be completely dry of any fuel (no fuel pressure) so backfiring is not surprising.  I would suggest you devise some kind of gravity feed system to the carb just for testing purposes.
As far as the ignition is concerned it really can't be 180 degrees out and that engine does not have a distributor in the conventional sense.  The coil fires both plugs at the top of the stroke (the two pistons rise and fall together, not alternately) which means the plug for one cylinder fires at the top of the compression stroke and the other one fires at the top of the exhaust stroke with no effect at all.  That is known as a waste spark.  360 degrees of crank rotation later both plugs are fired again but this time the two cylinders are at the opposite part of the 4 stroke cycle.
If the cam is timed properly then the only variable is the range of timing adjustment available at the vacuum advance actuator.  The only other possibility would be for the ignition (breaker point) cam to have slipped relative to the cam but since I have never taken one off I can't really say if that could happen.
Good luck.
BN

--- On
Tue, 3/10/09, tbwills

wrote:
> From: tbwills
> Subject: [anzhonda600owners] Fuel pump/ and back firing
> To: anzhonda600owners@yahoogroups.com
> Date: Tuesday, March 10, 2009, 6:53 PM
> I hooked a test light up to the power side of the fuel pump and it shows power to it, and cleaned the ground conetion, the pump still is not working, I'm assuming at this point that the pump is shot. I was able to get a little fuel into the carb and start it but it was back firing realy bad, would this just be the timing is off? If the distributor was off by 180 the car would'nt start at all would it? any advice is helpfull,
> Thanks

[paul tate]

A large syringe (without the needle) from the local feed store works great for a temporary fuel source.  Just add a short piece of fuel line and squirt it into the float bowl.  I've used this technique on motorcycles for years.  Also if you points are in poor condition or not gapped properly it can cause problems including running rough and back firing.  I think the point gap is on the fender well.  I can look it up if you like.  Before you pitch the fuel pump,  I would smack it a few times with the handle of a screwdriver and put voltage to it again.  Occasionally it actually works on electric devices that have been sitting for a while.  Worth a shot.  If it doesn't work, at least you got to take out a little frustration on in.
Good luck with it.

--- On
Tue, 3/10/09,
blake
neilson

wrote:
From: blake neilson
Subject: Re: [anzhonda600owners] Fuel pump/ and back firing
To: anzhonda600owners@yahoogroups.com
Date: Tuesday, March 10, 2009, 9:22 PM
If you are spraying fuel into the carb to get it to run, then the carb may be completely dry of any fuel (no fuel pressure) so backfiring is not surprising.  I would suggest you devise some kind of gravity feed system to the carb just for testing purposes.
As far as the ignition is concerned it really can't be 180 degrees out and that engine does not have a distributor in the conventional sense.  The coil fires both plugs at the top of the stroke (the two pistons rise and fall together, not alternately) which means the plug for one cylinder fires at the top of the compression stroke and the other one fires at the top of the exhaust stroke with no effect at all.  That is known as a waste spark.  360 degrees of crank rotation later both plugs are fired again but this time the two cylinders are at the opposite part of the 4 stroke cycle. If the cam is timed properly then the only variable is the range of timing adjustment available at the vacuum advance actuator.  The only other possibility would be for the ignition (breaker point) cam to have slipped relative to the cam but since I have never taken one off I can't really say if that could happen.
Good luck.
BN
--- On
Tue, 3/10/09, tbwills

wrote:
> From: tbwills
> Subject: [anzhonda600owners] Fuel pump/ and back firing
> To: anzhonda600owners@ yahoogroups. com
> Date: Tuesday, March 10, 2009, 6:53 PM
> I hooked a test light up to the power side of the fuel pump and it shows power to it, and cleaned the ground conetion, the pump still is not working, I'm assuming at this point that the pump is shot. I was able to get a little fuel into the carb and start it but it was back firing realy bad, would this just be the timing is off? If the distributor was off by 180 the car would'nt start at all would it? any advice is helpfull, > Thanks

Note: 1 image(s) originally linked in this post are no longer available (ec).

[Mike and Tami Speer]

Hi TB,
It could be too lean from a low fuel level and/or plugged jets in the carb causing the back firing, but I would concentrate on getting the fuel pump working first then take the next step.
With power hooked up to the pump you could try to tap lightly on the pump housing as already mentioned and see if it will start working but even if it does it would be best to replace it as it may fail again.
Check E-Bay as they show up periodically, Ray Cave (Midwest Wholesale) has them at times and he will bench test them prior to selling them, so you know they work.
Mike

[tloch220]

Don't scrap it yet! It is possible that the pump is mechanically gummed
up with old fuel and needs an internal cleaning. Also, be gentle when
connecting and disconnecting the fuel lines--I cracked the plastic and
ruined a good pump while trying to clean it.
Jon Mistchenko
71 AN600 beater
tbwills wrote:

> I hooked a test light up to the power side of the fuel pump and it
> shows power to it, and cleaned the ground conetion, the pump still is
> not working, I'm assuming at this point that the pump is shot. I was
> able to get a little fuel into the carb and start it but it was back
> firing realy bad, would this just be the timing is off? If the
> distributor was off by 180 the car would'nt start at all would it? any
> advice is helpfull,
> Thanks

[friend]

Any electric fuel pump with an output of 2 to 4 psi will work.  There are a number of them out there and since we are talking  J.C. Whitney up they have a number of them for as little as $40.00.  And they will mount in the same place as the original.
Bill

> -----Original Message-----
> From:
> anzhonda600owners@yahoogroups.com
> [mailto:anzhonda600owners@yahoogroups.com]
> On Behalf Of
> blake
> neilson
> Sent:
> Tuesday, March 10, 2009 6:22 PM
> To:
> anzhonda600owners@yahoogroups.com
> Subject:
> Re: [anzhonda600owners]
> Fuel pump/ and back firing
> If you are spraying fuel into the carb to get it to run,
> then the carb may be completely dry of any fuel (no fuel pressure) so > backfiring is not surprising.  I would suggest you devise some kind > of gravity feed system to the carb just for testing purposes.
> As
> far as the ignition is concerned it really can't be 180 degrees out and > that engine does not have a distributor in the conventional sense.
> The coil fires both plugs at the top of the stroke (the two pistons rise > and fall together, not alternately) which means the plug for one > cylinder fires at the top of the compression stroke and the other one > fires at the top of the exhaust stroke with no effect at all.  That > is known as a waste spark.  360 degrees of crank rotation later > both plugs are fired again but this time the two cylinders are at the > opposite part of the 4 stroke cycle. If the cam is timed properly then > the only variable is the range of timing adjustment available at the > vacuum advance actuator.  The only other possibility would be for > the ignition (breaker point) cam to have slipped relative to the cam but > since I have never taken one off I can't really say if that could > happen.
> Good luck.
> BN
> --- On
> Tue, 3/10/09,
> tbwills
>
> wrote:
> > From:
> > tbwills
> > Subject: [anzhonda600owners]
> > Fuel pump/ and back firing
> > To:
> > anzhonda600owners@ yahoogroups. com
> > Date: Tuesday, March
> > 10, 2009, 6:53 PM
> > I hooked a test light up to the power side of the fuel pump and it > > shows power to it, and cleaned the ground conetion, the pump still is > > not working, I'm assuming at this point that the pump is shot. I was > > able to get a little fuel into the carb and start it but it was back > > firing realy bad, would this just be the timing is off? If the > > distributor was off by 180 the car would'nt start at all would it? any > > advice is helpfull,
> > Thanks

[friend]

A simple trick to changing the AN600 filter is to remove the pump and disconnect the filter hoses, then remove the two small hoses from the pump to the filter.  Most are cracked while trying to pull the filter lines while the pump is bolted down.
Bill

> -----Original Message-----
> From:
> anzhonda600owners@yahoogroups.com
> [mailto:anzhonda600owners@yahoogroups.com]
> On Behalf Of
> Jonathan
> Mistchenko and Sarah Reeves
> Sent:
> Tuesday, March 10, 2009 7:51
> PM
> To:
> anzhonda600owners@yahoogroups.com
> Subject:
> Re:
> [anzhonda600owners] Fuel pump/ and back firing
> Don't scrap it yet! It is possible that the pump is mechanically gummed
> up with old fuel and needs an internal cleaning. Also, be gentle when
> connecting and disconnecting the fuel lines--I cracked the plastic and
> ruined a good pump while trying to clean it.
> Jon Mistchenko
> 71
> AN600 beater
> tbwills wrote:
> > I hooked a test light up to
> the power side of the fuel pump and it
> > shows power to it, and cleaned
> the ground conetion, the pump still is
> > not working, I'm assuming at
> this point that the pump is shot. I was
> > able to get a little fuel
> into the carb and start it but it was back
> > firing realy bad, would
> this just be the timing is off? If the
> > distributor was off by 180 the
> car would'nt start at all would it? any
> > advice is helpfull,
> Thanks

[a65tigrr]

If your not getting much fuel, you're running lean. A lean mixture can cause backfiring.
Greg

--- On
Tue, 3/10/09, tbwills

wrote:
From: tbwills
Subject: [anzhonda600owners] Fuel pump/ and back firing
To: anzhonda600owners@yahoogroups.com
Date: Tuesday, March 10, 2009, 8:53 PM
I hooked a test light up to the power side of the fuel pump and it shows power to it, and cleaned the ground conetion, the pump still is not working, I'm assuming at this point that the pump is shot. I was able to get a little fuel into the carb and start it but it was back firing realy bad, would this just be the timing is off? If the distributor was off by 180 the car would'nt start at all would it? any advice is helpfull, Thanks