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 Post subject: 1982 Diesel Fuel Pump
PostPosted: Tue Jan 09, 2018 1:10 pm 
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Looking to instal a electric fuel pump on my 82 diesel luv. Instructions say to bypass the mechanical pump, any idea on what two hoses to connect in order to by pass the original pump?? Any tips help, thanks!


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PostPosted: Tue Jan 09, 2018 2:40 pm 
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The only reason to install an electric pump is that you have something else wrong that needs attention. And the only pump in the system is the injection pump. You can’t bypass that, if you want it to run.

Why don’t we start with some troubleshooting?

Jack

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PostPosted: Tue Jan 09, 2018 8:09 pm 
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MeyerJ1945 wrote:
JoeIsuzu wrote:
The only reason to install an electric pump is that you have something else wrong that needs attention. And the only pump in the system is the injection pump. You can’t bypass that, if you want it to run.

Why don’t we start with some troubleshooting?

Jack


Bought the truck awhile back and have replace all the normal maintenance stuff; fuel filter, oil, etc. I ended up losing a copper crush washer from the injection line to the banjo bolts. Finally found some new washers but then broke a banjo bolt. Ended up finding some bolts and went to put them on and it wouldn’t start. Put a new starter on it and now it cranks but isn’t getting any fuel..so that’s where I am, bought an electric pump and have everything ready to install. Excuse some of my wordage I’m not terribly mechanically inclined

Not a problem. Sounds like you're making some progress. It just occurred to me that you were referring to the priming pump. I didn't think of that because it's only used when you replace a fuel filter, run out of fuel, or otherwise open up the fuel system. Those primer pumps can go bad, but it's generally something else (easier and cheaper).

It is very normal to take a while to get it to "fire" once you've opened up the fuel system. I have no doubt you're right, it isn't getting any fuel. You can help speed it up by bleeding as much air as possible from the system. To do that, you need to find the line that runs from your priming pump to the fuel injection pump. Disconnect that from the injection pump. Begin pumping (pressing the disk on top of the primer) and continue until fuel dribbles out of the line you disconnected. The priming pump has a very short stroke, so don't assume it's not doing anything. If you get this far, report back here. I'll hold off on next steps, because you may not get fuel. That's a different issue we'll need to troubleshoot.

Jack

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PostPosted: Tue Jan 09, 2018 8:50 pm 
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Once I replaced starter and tried firing, I tried using the priming pump for a quite a while, but didn’t get anything.. there was no fuel coming out of the line you are talking about after priming. Any other ideas...? Thanks!


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PostPosted: Tue Jan 09, 2018 9:08 pm 
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MeyerJ1945 wrote:
Once I replaced starter and tried firing, I tried using the priming pump for a quite a while, but didn’t get anything.. there was no fuel coming out of the line you are talking about after priming. Any other ideas...? Thanks!

Most likely: you are pulling in air rather than fuel, via a bad fuel line or loose connection. It won’t show up because air leaks in rather than fuel leaking out. It’s like trying to drink from a straw with a hole in it (near the top). You just get air.

Less likely, but possible: your priming pump is bad.

I’d replace the 35 year old fuel lines and make sure clamps are good on every connection. But you might get by short-term by trimming about 1/2-3/4 inch of the brittle ends and reconnecting the lines. A small crack is all it takes to let air in.

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PostPosted: Tue Jan 09, 2018 10:26 pm 
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Okay, I will try that next and let you know. Thank you!


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