Universal M4-30 injector pump rebuild - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 09-29-2010
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Universal M4-30 injector pump rebuild

After a time sitting my engine quit abruptly underway. Spent 30 hours sailing 40 miles in 0 - light wind. I bled the engine numerous times and changed all filters. HOWEVER. When I crack the fuel line to the injectors no fuel comes out. After much reading and my limited knowledge of engines I have concluded the injector pump is not pumping. Does this sound correct? If so I am wondering if anyone has gotten their injector pump rebuilt and wondering the cost and if it's fairly easy to take the pump off myself. I'm out cruising now and have limited time to be engineless without great hardship. Any help would be greatly appreciated.
Thank you.
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Old 09-29-2010
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You should read through this.

http://www.sailnet.com/forums/diesel...ctor-pump.html
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Old 09-29-2010
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Do you have the throttle wide open when you crack the lines at each injector? A long shot that the injection pump would suddenly quit completely. Assume you don't mean the low pressure (lift) pump and are getting fuel out of the other bleed connections.

Injection pump rebuild is not cheap. Must be done by a qualified diesel injection shop, not a diesel mechanic.
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Old 09-29-2010
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Quote:
Originally Posted by WanderingFool View Post
After a time sitting my engine quit abruptly underway. Spent 30 hours sailing 40 miles in 0 - light wind. I bled the engine numerous times and changed all filters. HOWEVER. When I crack the fuel line to the injectors no fuel comes out. After much reading and my limited knowledge of engines I have concluded the injector pump is not pumping. Does this sound correct? If so I am wondering if anyone has gotten their injector pump rebuilt and wondering the cost and if it's fairly easy to take the pump off myself. I'm out cruising now and have limited time to be engineless without great hardship. Any help would be greatly appreciated.
Thank you.
The above advice is all spot on, but I thought I'd chuck this in: How much fuel are you expecting to come out when you say "crack the fuel line"??

Try this first:
1. Disconnect the fuel lines at the injectors completely. Cap off the injectors so you don't get anything in them.
2. Put a clean rag under the ends to catch any fuel that comes out.
3. Have someone crank the engine - for several seconds. You should see tiny spurts of fuel out the end of each fuel line.

Cheers,
Cameron
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Last edited by Classic30; 09-29-2010 at 08:06 PM.
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Old 09-29-2010
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Thank you for all the replies.
Throttle all the way open and NOTHING out of the injector pump.
All other bleed points I am getting fuel.
When I have bled the system before, when I crack the fuel lines from the injector pump the fuel comes out at a high rate, today, absolutely nothing. Not even a dribble.
I understand that a rebuild is 'not cheap', however that is a relative term and any hard number that others might have experienced would be great to know for immediate budget reasons. $250, $500, $750???
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WF, if you take the time to read through the thread that The Venerable Mr TD Wombat posted above, you'll see I forked out $1,000 Aussie for a re-build of mine (it was to be more than that but I talked them down on their parts mark-up)... so not something you really want to do until you've checked everything else.

Personally, I find it hard to believe the pump would pack up completely - it's more likely that you'd lose fuel to one of the cylinders and the engine would run rough for a while - but anything is possible I suppose.

You'll need to follow the Workshop Manual exactly to get it out (but it isn't really all that difficult to do) and an Injection Shop should be able to refurbish it for you in a day or two - particualrly if you tell them it's urgent.

Good luck!
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mine is a ford lehman, 4 cylinder. cost to rebuild pump was 1200 bucks.mine did the same thiing. no it runs at a higher rpm.
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Note you can download Universal service manuals from Marine Diesel Direct (Torrensen) for free. Lots of good info on the pump, injectors, governor, etc. Get it if you don't already have it. The fuel injection pump is driven by a camshaft in the engine - not likely to suddenly fail. I would just want to check out all the easy possibilities before I pulled the injection pump and sent it to the shop.
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Old 10-01-2010
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It sounds like the transfer pump quit. (I'm a diesel/hvy. equip. mech.)

a quick search on your motor says you have an electric fuel pump (if it's after 1986) feeding the injection pump. check that 1st. A small universal fit "Bendix tic tic type" electric fuel pump would replace it if you can't get a direct replacement pump.


If you don't have an elec. pump feeding it then it's probably a diaphragm type pump (like an older car fuel pump) and can be rebuilt by you if you have basic mech. skills. simply a few screws/bolts and replace a few diaphragms.

cleanliness is important when working around open fuel lines.

Universal Diesel Engine Owners Manual - Fuel System - Marine Diesel Direct / Torresen Sailing Site


p.s. you only get tiny drops of fuel out of the cracked lines, it doesn't gush out.
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Last edited by MacGyverRI; 10-01-2010 at 01:49 AM.
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