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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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 Posted: Wed Dec 02, 2015 7:51 am Post subject: Difference between the 2 fuel pumps. |
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I have a 1980 931 I have been messing with, seems to have low fuel pressure because I can't get the injectors to open when adjusting the afr screw. They only open when I manually press down on the metering plate.
Before it's mentioned, I am going to invest in a via pressure tester at some point just don't have the money and feel like tinkering.
My external pump vibrated a lot when I originally got it and Im kinda thinking its on its way out.
-Which pump provides the most pressure in the system?
-if it's not the pump, and I would like to do this regardless... Would it hurt or help anything as far as cleaning the distributor and the injectors to fill my tank and add a modest amount of seafoam or fuel injection cleaner and run a few gallons of fuel through the injectors with them out? I wonder if over the few years it's been sitting if anything is stuck inside the dist.
I know I need to clean the tank at some point regardless, I just don't feel up to it myself in my small garage without a lift, it just feels like the kind of thing I would mess up and be out of luck.
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1980 931 ~ 67,000 miles |
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jason c
Joined: 13 Jan 2014
Posts: 1018
Location: Nwi
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| Posted: Wed Dec 02, 2015 11:48 am Post subject: Re: Difference between the 2 fuel pumps. |
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| McMichem wrote: | I have a 1980 931 I have been messing with, seems to have low fuel pressure because I can't get the injectors to open when adjusting the afr screw. They only open when I manually press down on the metering plate.
Before it's mentioned, I am going to invest in a via pressure tester at some point just don't have the money and feel like tinkering.
My external pump vibrated a lot when I originally got it and Im kinda thinking its on its way out.
-Which pump provides the most pressure in the system?
-if it's not the pump, and I would like to do this regardless... Would it hurt or help anything as far as cleaning the distributor and the injectors to fill my tank and add a modest amount of seafoam or fuel injection cleaner and run a few gallons of fuel through the injectors with them out? I wonder if over the few years it's been sitting if anything is stuck inside the dist.
I know I need to clean the tank at some point regardless, I just don't feel up to it myself in my small garage without a lift, it just feels like the kind of thing I would mess up and be out of luck. |
Fun with editing.....
| McMichem wrote: | | I have a 1980 931 I have been messing with......adjusting the afr screw.....I am going to invest in a via pressure tester at some point just don't have the money and feel like tinkering........it just feels like the kind of thing I would mess up and be out of luck. |
Seriously though.....
Yes, clean the system. I would take apart as much as possible, clean it all out & run some FI cleaner through the system with the injectors out & lines in bottles. Letting the cleaner sit the system for awhile will help.
If there's junk in the tank & you don't clean it out, you'll be right back where you started.
The second pump does most of the work.
You're better in the long run not to start messing with anything until you get a tester, read a manual & understand it. |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Fri Jan 01, 2016 4:35 am Post subject: Re: Difference between the 2 fuel pumps. |
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| McMichem wrote: | | I can't get the injectors to open |
The mechanical injectors do seize. It's possible they're bad. Do you have any known good alternates to use for testing purposes?
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erstwhile owner of just about every 924 variant ever made |
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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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| Posted: Fri Jan 08, 2016 6:08 pm Post subject: |
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I don't have any extra's to test them. I need to have a few sections of fuel lines made before I can even do that and can't find a slice cheaper than $300 for the set so it might be a while.
Thinking I have a fuel pressure issue as I think suggested by either you or Eddie in another post. Gonna get the fuel lines made eventually (possibly have shrader valve put on it if that's possible so I can test fuel pressure up to the dist.). If that's the issue I'm most likely gonna drop $140 at your store for a new pump.
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1980 931 ~ 67,000 miles |
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