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fuel pump seal - DIY info needed please

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PAJERO94
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PostPosted: Sun Feb 04, 2018 13:25    Post subject: Reply with quote

I agree I wouldn’t want something done just to hide the real issue .

Can I ask as I’m not up on these things by an air leak do you mean it’s sucking air into the system or leaking fuel out ?

How will an air leak be visible to trace ? Will it also leak fuel ?
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PostPosted: Sun Feb 04, 2018 13:25    Post subject: Google Ads keep the POCUK free to join!


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Simon_W
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PostPosted: Sun Feb 04, 2018 13:44    Post subject: Reply with quote

PAJERO94 wrote:
I agree I wouldn’t want something done just to hide the real issue .

Can I ask as I’m not up on these things by an air leak do you mean it’s sucking air into the system or leaking fuel out ?

How will an air leak be visible to trace ? Will it also leak fuel ?


It's sucking air in.  The fuel line from the tank to the injection pump is under partial vacuum as it's sucked from the injection pump rather than pushed from the tank end. So if there's a pinhole somewhere, air can get in.  That allows fuel to run back to the tank as there's no vacuum held to stop it from doing so.

As I wrote earlier, start by checking the hose clamps and fuel filter. If that doesn't do the trick, use some clear hose between the filter and the injection pump and from the fuel line to the filter. It's 8mm internal.   You should then be able to see from the air bubbles if the problem is starting at the filter housing or if air is getting in before that.  If the problem is before the filter, it's probably best to simply replace both the fuel line and the fuel pickup in the tank.  It's easiest to replace the metal fuel line with either nylon or rubber fuel hose. The hose can be run alongside the old metal fuel line and held in place with cable ties. I think Milners sell replacement fuel pickups. On the Paj/Shogun there's a hatch in the floor so you can access the tank top. (on mine, the tank has to be dropped).

If you do replace the metal fuel lines with hose, it's probably worth replacing the fuel return line at the same time. That one is 6mm internal.
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PAJERO94
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Age: 50
Zodiac: Scorpio
Joined: 25 Jun 2008
Posts: 33
Location: south wales(newbridge)

PostPosted: Sun Feb 04, 2018 14:18    Post subject: Reply with quote

Simon_W wrote:
PAJERO94 wrote:
I agree I wouldn’t want something done just to hide the real issue .

Can I ask as I’m not up on these things by an air leak do you mean it’s sucking air into the system or leaking fuel out ?

How will an air leak be visible to trace ? Will it also leak fuel ?


It's sucking air in.  The fuel line from the tank to the injection pump is under partial vacuum as it's sucked from the injection pump rather than pushed from the tank end. So if there's a pinhole somewhere, air can get in.  That allows fuel to run back to the tank as there's no vacuum held to stop it from doing so.

As I wrote earlier, start by checking the hose clamps and fuel filter. If that doesn't do the trick, use some clear hose between the filter and the injection pump and from the fuel line to the filter. It's 8mm internal.   You should then be able to see from the air bubbles if the problem is starting at the filter housing or if air is getting in before that.  If the problem is before the filter, it's probably best to simply replace both the fuel line and the fuel pickup in the tank.  It's easiest to replace the metal fuel line with either nylon or rubber fuel hose. The hose can be run alongside the old metal fuel line and held in place with cable ties. I think Milners sell replacement fuel pickups. On the Paj/Shogun there's a hatch in the floor so you can access the tank top. (on mine, the tank has to be dropped).

If you do replace the metal fuel lines with hose, it's probably worth replacing the fuel return line at the same time. That one is 6mm internal.


Starting to make sense now thanks

The last few mot tests have mentioned corrosion on fuel pipes so may be a good place to start
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PAJERO94
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Age: 50
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Location: south wales(newbridge)

PostPosted: Sun Feb 04, 2018 20:53    Post subject: Reply with quote

What mileage does the fuel pump seal usually fail on roughly ??
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Mark3
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PostPosted: Sat Feb 10, 2018 19:28    Post subject: Reply with quote

No set miles, I changed one that was on 40k km's and another on 286k miles......
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