No squirt

Does your Mitsubishi L300 make a strange noise? Need wheel alignment specs?
Post Reply
Rattlenbang
Posts: 647
Joined: Sun Dec 16, 2012 8:29 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: delica
Location: Victoria

No squirt

Post by Rattlenbang »

I stooped off at the FLAPS, and when I went to leave she wouldn't start. It's been a bit temperamental lately, but always started fairly quickly. I checked for fuel and it was getting to the injection pump and returning via the return line. But after pulling an injection line, no fuel reaching injectors. I checked for 12V at the shutoff solenoid, and I can hear it clicking, but its as if the pump has been shut off.

I haven't found much info about the injection pump, but does anyone know if there's some other tests I can do before pulling it and sending it to Wilson and Proctor?
My new novel A Dark and Promised Land has just been released by Dundurn Press. "On the eve of war he is compelled to reclaim her love, setting himself against his people amid a conflict that will form a nation." http://www.darkpromisedland.com/
Rattlenbang
Posts: 647
Joined: Sun Dec 16, 2012 8:29 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: delica
Location: Victoria

Re: No squirt

Post by Rattlenbang »

No suggestions? Really? It seems that IPs are the black box of the automotive world. I guess I have to just scratch my head, wake a few fleas and figger it out on my sad lonesome. Fuel is returning via the return line so I know the pump is getting fuel. Shut off solenoid or internal mechanical failure. I suppose one could insert a probe through the bleed/timing port and verify that the high pressure pump plunger is actually moving. After that, I've decided to pull the pump and disassemble it myself. Watch for step by step photos if it reaches that point.
My new novel A Dark and Promised Land has just been released by Dundurn Press. "On the eve of war he is compelled to reclaim her love, setting himself against his people amid a conflict that will form a nation." http://www.darkpromisedland.com/
User avatar
TardisDeli
Posts: 1425
Joined: Tue Sep 18, 2007 10:57 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: 1991 L300. 1997 L300.
Location: Burnaby
Location: Burnaby, Gaglardi freeway exit
Contact:

Re: No squirt

Post by TardisDeli »

hi simon, yup, ip's are black holes in the space time continuum. i know there are 2 separate filters inside the ip, unable to access without dismantling. these clog. if you do take yrs apart, be super organised, there are some tiny bits that look reversible but are actually slightly different sizes at either end and will cause catastrophes, so get your cooky baking trays out and lay a clean towel on each and put every piece exactly in order and direction on them, so can re assemble after. dont know about the pump system electrically, it is NOT a usual delica issue. Have you checked your fuel filter, undo each hose and put each into a jar, one with fuel in, and turn ignition keys multiple times to get it to purge, I had a chunka crud lodged in there once, miracle cure once crud gone. good luck christine.
Christine
Of The TardisDeli My TardisDeli travels thru time and space. Our house is nicknamed the TardisDeli Motel, as so many delii owners visit to share delii stories.
Rattlenbang
Posts: 647
Joined: Sun Dec 16, 2012 8:29 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: delica
Location: Victoria

Re: No squirt

Post by Rattlenbang »

The fuel is running fine through the pump, but while rotating it's not pushing any out; that means either mechanical failure of the cam plate or plunger or the solenoid valve isn't allowing fuel into the plunger bore. Either that or a lump of crud blocking internal ports, which would be weird given that fuel passes through a 10 u filter. I'm itching to get at it and see what's happening.
My new novel A Dark and Promised Land has just been released by Dundurn Press. "On the eve of war he is compelled to reclaim her love, setting himself against his people amid a conflict that will form a nation." http://www.darkpromisedland.com/
Rattlenbang
Posts: 647
Joined: Sun Dec 16, 2012 8:29 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: delica
Location: Victoria

Re: No squirt

Post by Rattlenbang »

Hooray, looks like the problem was just a bad connection to the fuel shut off valve. There are two connections to it just on the pump itself. The big fat one on top of the pump seemed to be making intermittent contact. I had a hunch it was electrical because of the complete pumping/no pumping situation, which isn't typical IP pump failure, but with the valve way down under at the back it's very hard to reach with a meter. Just measuring 12V at the pump connector doesn't mean it's getting all the way through to the valve, which in this case it wasn't.
My new novel A Dark and Promised Land has just been released by Dundurn Press. "On the eve of war he is compelled to reclaim her love, setting himself against his people amid a conflict that will form a nation." http://www.darkpromisedland.com/
User avatar
thedjjack
Posts: 2025
Joined: Wed Jan 27, 2010 12:13 am
Member's Photo Album: http://www.delica.ca/forum/ucp.php?i=164
Vehicle: 1989 L300 HITOP!!
Location: Port McNeill
Location: Port McNeill
Contact:

Re: No squirt

Post by thedjjack »

it is 12 volts to allow fuel...right? always wondered
Rattlenbang
Posts: 647
Joined: Sun Dec 16, 2012 8:29 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: delica
Location: Victoria

Re: No squirt

Post by Rattlenbang »

Yup, it's how you are able to shut off the engine, because the entire system is fully mechanical and self sustaining, without it it would run until it had used up all the fuel. Something elegant about that.
My new novel A Dark and Promised Land has just been released by Dundurn Press. "On the eve of war he is compelled to reclaim her love, setting himself against his people amid a conflict that will form a nation." http://www.darkpromisedland.com/
User avatar
thedjjack
Posts: 2025
Joined: Wed Jan 27, 2010 12:13 am
Member's Photo Album: http://www.delica.ca/forum/ucp.php?i=164
Vehicle: 1989 L300 HITOP!!
Location: Port McNeill
Location: Port McNeill
Contact:

Re: No squirt

Post by thedjjack »

yep that I knew just was not 100% that power held the valve open (I assumed it did)..

Good to hear you are running again...
User avatar
TardisDeli
Posts: 1425
Joined: Tue Sep 18, 2007 10:57 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: 1991 L300. 1997 L300.
Location: Burnaby
Location: Burnaby, Gaglardi freeway exit
Contact:

Re: No squirt

Post by TardisDeli »

Glad you solved it Simon. Can you or Dave do a troubleshooting write-up here, to add to our understanding of La Delica. Tx, Christine.
Christine
Of The TardisDeli My TardisDeli travels thru time and space. Our house is nicknamed the TardisDeli Motel, as so many delii owners visit to share delii stories.
Rattlenbang
Posts: 647
Joined: Sun Dec 16, 2012 8:29 pm
Member's Photo Album: http://www.delica.ca/Photos/
Vehicle: delica
Location: Victoria

Re: No squirt

Post by Rattlenbang »

This is troubleshooting for a situation of no output from the injection pump, which would be an uncommon form of IP failure. The first symptom of course is no start, which in a diesel usually means no fuel.
Generally, no fuel would point to a clogged fuel filter, but in my experience that first shows as inability to idle and very poor performance, rather than a totally dead engine. A clogged filter can be determined by pumping the fuel primer a few times to see if the engine runs better. If it does, time to replace the fuel filter.

In my situation there was no injector output from the injection pump at all. Loosening one of the injector lines showed that no fuel pulses were coming out of the IP. A quick and easy way to check that the filters, lines and internal fuel pump are all working, is to remove the fuel return hose from the IP and see if fuel is coming out when the engine is cranked. If so, the problem lies with the IP.

If there is no fuel coming out, the internal fuel pump is gone (unlikely) or the fuel supply is interrupted.

In my case there was a steady flow of fuel out the fuel return, so I knew everything before the IP was working, as well as the internal fuel pump.

Fuel shutoff in the IP is controlled by a 12V signal from the ignition switch, which opens a solenoid valve and allows fuel into the fuel plunger. This signal runs through the large multi wire connector on top of the IP, the one closest to the driver’s side.
In this connector the black wire at the top and closest to the driver is the 12V signal wire. There should be 12V at this connector (check both sides, my connector was faulty and wasn’t passing the 12v through). Additionally, there is another final spade connector between the solenoid itself and the signal wire, another potential source of problems. This second connector is down deep behind the pump and difficult to reach.

The solenoid is a round device at the rear of the IP, just above the distributor with the steel injection lines that go to the injectors. It can be hard to get a probe in there, but with the key on there must be 12V on the electrical connector at the top of the solenoid. The solenoid is covered by a heavy black boot that must be pried off with a screwdriver.

If 12V is not present, check the spade connector, then the big connector on top of the IP. If there is 12V on the solenoid, then either the solenoid is gone, or there has been major mechanical failure inside the pump. Having someone turn the ignition key off and on can help; if the solenoid is good you should hear a slight clicking as it engages.
If there is no clicking you will have to remove the throttle cable brackets to reach the solenoid. Remove the 12V signal wire and do a continuity check from the solenoid terminal to ground; if open, the solenoid must be replaced.

If it checks good, remove the solenoid, and by attaching 12V to the electrical terminal, verify that it actuates. If it still checks out OK, then the IP must be removed and disassembled.


Example of VE distributor style injection pump, slightly different from our Delica models:

Image
My new novel A Dark and Promised Land has just been released by Dundurn Press. "On the eve of war he is compelled to reclaim her love, setting himself against his people amid a conflict that will form a nation." http://www.darkpromisedland.com/
Post Reply

Return to “L300 Technical”