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  #1  
Old 09-28-2009, 04:55 PM
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Fuel priming pump?

Is this the pump you use to prime the fuel? If so, how do you operate it? I tried pulling and twisting it without any luck. I didn't want to break it, though.

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  #2  
Old 09-28-2009, 05:04 PM
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Yes, the round handle is the diesel manual pump. At risk of being a smartass, the instructions for this pump are in the owner's handbook no less!

Turn the pump knob anti-clockwise to release, pull it out about 1.5" and start pumping. The blighter will start leaking diesel if it's like mine but should do the job. Once primed push in the knob and turn clockwise until tight, or diesel will leak when you run the engine.

Your primary and secondary fuel filters look rather old in the picture. I'd suggest you replace them while you're in there. if you fill the new secondary filter with fuel or ATF it will cut down significantly on the amount of pumping you need to do.

Good luck.
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Old 09-28-2009, 05:06 PM
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Yup thats the one. The one on my 77 is really hard to turn, so that could be holding you up.
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Old 09-28-2009, 05:46 PM
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The Old style Hand Primer Pumps like you have in your picture are prone to allowing air to be sucked in to the Fuel System when they have been on the engine for a long time.

If your Engine runs fine after priming do not worry about it. Later if your Engine starts running rough you might consider changing to the new Style Hand Primer Pump.

Pump on the Hand Primer until you hear a buzzing, shushing, squeeking sound coming from the Fuel Injection Pump. After that keep pumping a little more to make sure all the air is out.
However, that only gets the Air out of the low pressure Fuel Supply System.

If your Engine won't start after the above there is a good chance that you have Air trapped between the Fuel Injection Pump and the Injectors in the High Pressure part of the system.Loosen the Steel Fuel Injection Tubing Nuts up by the Injector and crank the Engine until you see fuel coming out from under all.
Afterwhich, tighten the nuts and start.
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Old 09-28-2009, 06:02 PM
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Agreed, unscrew, pump, when back down, screw in.
Install a new black model, just pump it, no need to unlock (unscrew) and lock (screw). They run about $20.
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Old 09-28-2009, 06:50 PM
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Answer

Quote:
Originally Posted by Dee8go View Post
Is this the pump you use to prime the fuel? If so, how do you operate it? I tried pulling and twisting it without any luck. I didn't want to break it, though.
* Unscrew the knob.
* Pump the handle until the fuel bypass valve squeaks
NOTE: the pump should not leak fuel.
* Screw the handle down.





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  #7  
Old 09-28-2009, 06:51 PM
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It is very likely that while pumping it will spray fuel everywhere.....mine did. I replaced it with a newer style one.
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  #8  
Old 09-28-2009, 07:00 PM
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The new style pumps are a direct replacement for the old ones.
Here's a link with images of the old and new style.
Hope it helps.
Here's my payback! Diesel Primer Pump Replacement
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Last edited by bobodaclown; 09-28-2009 at 07:03 PM. Reason: added link with images of the pump styles
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  #9  
Old 09-28-2009, 08:14 PM
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Quote:
Originally Posted by 300sdToronto View Post
if you fill the new secondary filter with fuel or ATF it will cut down significantly on the amount of pumping you need to do.

Good luck.
I always prefill my secondary filter and my primer pump has never been used. I plan to replace it just to avoid the air leak problem. Cheap insurance!
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  #10  
Old 09-28-2009, 08:17 PM
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or.. you could just take it off all together and put in an electric pump. this way you will never have to prime it by hand again... just let the electric pump do the work and start it back up.
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  #11  
Old 09-28-2009, 09:07 PM
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Quote:
Originally Posted by 1lowdiesel View Post
or.. you could just take it off all together and put in an electric pump. this way you will never have to prime it by hand again... just let the electric pump do the work and start it back up.

Of course his Old Primer Pump may be good and not need replacing at all.

But, the $18-$27 cost of New Style Hand Primer compared to the over $150 cost of a suitable electric fuel pump seems a little hard to justify.

And, with an Electric Fuel Pump you would loose the ability to run you Engine in the event of an electrical failure.

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