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914World.com _ 914World Garage _ Fuel
Posted by: Chip Mar 25 2018, 10:51 PM
Hi everyone! My 1.7 sat for over 30 years. Need to drain tank and install new pump, lines, filter. Anyone know what size lines (braided) come out of the tank? Fuel pump has been moved to front. Also need a good fuel pump. Original Bosch is over $600.
Thanks!
Attached image(s)
Posted by: ndfrigi Mar 26 2018, 12:44 AM
Hello, these images may help you. About the fuel pump, you might want to consider using 2 port inline type of fuel pump that are used for later 914. less return line with split. And if you still have the original plastic tunnel fuel lines, maybe it’s time to replace them with SS fuel tunnel lines and also for engine bay fuel lines.
Posted by: The Cabinetmaker Mar 26 2018, 07:31 AM
Yes, on the late style pump. No, on the braided line. The fuel will seep through the braids after the rubber breaks down from ethanol fuel. Use only hose rated for ethanol, unless you have real gas in your area.
Posted by: bdstone914 Mar 26 2018, 08:19 AM
Yes on the 2 port pump and SS lines. If you keep the pump up front you are now pressuring lines that were not meant for that purpose. Later cars had heavier lines when the pump were moved up front. 7.5 and 9.5mm are the line sizes.
Posted by: Chip Apr 6 2018, 08:02 PM
Thanks mucho, gentlemen! When the purged fuel tank returns, I can get after it. The sludge/tar/goop that was inside the tank was unbelievable. I found a great radiator shop that is cleaning it out. Thank you, ndfrigi, for the terrific diagrams. Will use ss for all lines now, as I have no idea of what's in the original hoses.
Thank you!
Posted by: Chip Apr 6 2018, 08:23 PM
Yes, on the late style pump. No, on the braided line. The fuel will seep through the braids after the rubber breaks down from ethanol fuel. Use only hose rated for ethanol, unless you have real gas in your area.
You can't imagine how much you have helped me!
Thanks again!!
Posted by: mgphoto Apr 7 2018, 11:37 AM
Do you know for sure the fuel pump is bad?
Most times you can run it backwards in a bucket of gas, to clean it out, be careful of sparks do it outside and have a fire extinguisher ready.
Posted by: Chip Apr 7 2018, 07:22 PM
Do you know for sure the fuel pump is bad?
Most times you can run it backwards in a bucket of gas, to clean it out, be careful of sparks do it outside and have a fire extinguisher ready.
The pump could be good. The "R" port was completely blocked with black, solid gunk.
Can you please explain how I can clean it & check it out?
Attached image(s)
Posted by: mgphoto Apr 9 2018, 01:39 PM
OK this is not for the faint of heart nor should it be done in a haphazard fashion.
Plan your problems, (what if I knock over the bucket?) and so on. Be ready.
Have a fire extinguisher, for combustible liquids like gasoline, a good one, close by.
Fill a plastic bucket with just enough gasoline to cover the fuel pump. Do this someplace that is safely away from structures and combustible materials.
Rig up two wires about 8 to 10 feet long, one end connect crimp on connectors to accept the pumps terminals. The other end use a battery clamp such as the items listed below (no affiliation)
https://www.globalindustrial.com/p/electrical/Terminals-and-Disconnects/Alligator-Clips/battery-clamp-30-amp-copper-clad-1rd-1blk-2-pk?infoParam.campaignId=T9F&gclid=EAIaIQobChMIzJeWwvSt2gIVw1YNCh1KgAA2EAYYBCABEgLPj_D_BwE[/url]
Try to remove as much gunk as possible, don't damage anything. After connecting the wires to the pump ONLY, place it in the gasoline, a full charged car battery works best for this.
Place the fire extinguisher between the battery and the bucket, connect the wires to the battery terminals for 15 seconds, than reverse the polarity.
Do this for a few minutes, keep reversing the polarity, soon enough the pump should clear.
Now a days fuel pumps are inside the fuel tank, ours are sealed just as the newest ones are, so just be careful, use your head.
If this doesn't work than you will need to get this one rebuilt or swap it for a rebuilt.
Good luck and be careful!
Posted by: Chip Apr 10 2018, 11:20 AM
OK this is not for the faint of heart nor should it be done in a haphazard fashion.
Plan your problems, (what if I knock over the bucket?) and so on. Be ready.
Have a fire extinguisher, for combustible liquids like gasoline, a good one, close by.
Fill a plastic bucket with just enough gasoline to cover the fuel pump. Do this someplace that is safely away from structures and combustible materials.
Rig up two wires about 8 to 10 feet long, one end connect crimp on connectors to accept the pumps terminals. The other end use a battery clamp such as the items listed below (no affiliation)
https://www.globalindustrial.com/p/electrical/Terminals-and-Disconnects/Alligator-Clips/battery-clamp-30-amp-copper-clad-1rd-1blk-2-pk?infoParam.campaignId=T9F&gclid=EAIaIQobChMIzJeWwvSt2gIVw1YNCh1KgAA2EAYYBCABEgLPj_D_BwE[/url]
Try to remove as much gunk as possible, don't damage anything. After connecting the wires to the pump ONLY, place it in the gasoline, a full charged car battery works best for this.
Place the fire extinguisher between the battery and the bucket, connect the wires to the battery terminals for 15 seconds, than reverse the polarity.
Do this for a few minutes, keep reversing the polarity, soon enough the pump should clear.
Now a days fuel pumps are inside the fuel tank, ours are sealed just as the newest ones are, so just be careful, use your head.
If this doesn't work than you will need to get this one rebuilt or swap it for a rebuilt.
Good luck and be careful!
Can't wait to try this. Thank you very much. Will take all the precautions. Perhaps the local fire dept. will allow me to do it in their parking bay? (Kidding).
Posted by: The Cabinetmaker Apr 10 2018, 11:46 AM
Might try replying to a quote outside the quote box [ ].
Hard to find your reply inside the box.
Posted by: Chip Apr 16 2018, 02:42 PM
OK this is not for the faint of heart nor should it be done in a haphazard fashion.
Plan your problems, (what if I knock over the bucket?) and so on. Be ready.
Have a fire extinguisher, for combustible liquids like gasoline, a good one, close by.
Fill a plastic bucket with just enough gasoline to cover the fuel pump. Do this someplace that is safely away from structures and combustible materials.
Rig up two wires about 8 to 10 feet long, one end connect crimp on connectors to accept the pumps terminals. The other end use a battery clamp such as the items listed below (no affiliation)
https://www.globalindustrial.com/p/electrical/Terminals-and-Disconnects/Alligator-Clips/battery-clamp-30-amp-copper-clad-1rd-1blk-2-pk?infoParam.campaignId=T9F&gclid=EAIaIQobChMIzJeWwvSt2gIVw1YNCh1KgAA2EAYYBCABEgLPj_D_BwE[/url]
Try to remove as much gunk as possible, don't damage anything. After connecting the wires to the pump ONLY, place it in the gasoline, a full charged car battery works best for this.
Place the fire extinguisher between the battery and the bucket, connect the wires to the battery terminals for 15 seconds, than reverse the polarity.
Do this for a few minutes, keep reversing the polarity, soon enough the pump should clear.
Now a days fuel pumps are inside the fuel tank, ours are sealed just as the newest ones are, so just be careful, use your head.
If this doesn't work than you will need to get this one rebuilt or swap it for a rebuilt.
Good luck and be careful!
Can't wait to try this. Thank you very much. Will take all the precautions. Perhaps the local fire dept. will allow me to do it in their parking bay? (Kidding).
Dear mgphoto:
I tried the backflush w/gas method, and after a few shots, the pump began to hum, but then it slows to kind of a chug, chug. When first connected in the right way, it buzzes, then slows. What should it sound like when it is clear?A lot of gunk came out of it. I think it's working! Thank you.
Posted by: Chip Apr 16 2018, 02:44 PM
Might try replying to a quote outside the quote box [ ].
Hard to find your reply inside the box.
Thanks. How do I do this? This site is hard for me to learn. There is no "send" button either.
Posted by: mgphoto Apr 17 2018, 05:04 PM
Might try replying to a quote outside the quote box [ ].
Hard to find your reply inside the box.
Thanks. How do I do this? This site is hard for me to learn. There is no "send" button either.
This site, as do all websites, uses coding to produce pages for viewing, they are not that difficult to decode. Also anything you post you can edited, just keep that in mind.
As for the pump, you may not be out of the woods yet, the pump needs to supply 28 PSI of constant pressure to be functional.
As for the sound, it is a sort of a hum, it is noticeable when the key is turned from off to on before turning the key to start. The pump will run for 2 seconds to pressurize the fuel ring, than shut off if the engine is not started.
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