XJ40 ( XJ81 ) 1986 - 1994

Water in fuel

 
  #1  
Old 07-16-2018, 06:49 PM
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Default Water in fuel

My car was out in a storm few months back, few days later i went to put petrol in and there was water under the fuel flap and the filler was sitting in a pool of water. I cleaned the drain hole looked like a seed or but had caught in it leading it to block. I cleared it, went to get petrol and on removing filler cap noticed about an inch of water sitting above the fuel flap down in the filler hole. I sucked it out with a straw as I didnt want it in the tank. I put petrol in....and for a day or so no problem. Then the car died on me while driving, shaking engine, no power, missing, and back firing. It hasnt been able to run or go far since, same symptoms.
I have removed the fuel filter, which was full of yellow watery gunk and replaced, and drained the tank in situ with a hose.
I think its obvious i have water in the tank, any more suggestions on what to do apart from what I have done? Somebody suggested put a litre of metho in with the ten litres of fresh fuel i have in there now. Should I blow the line out ?
 
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Old 07-20-2018, 10:41 PM
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Hi mickvic,

If you drained the tank you may have already removed all the water, but an easy method to be sure is to disconnect the fuel feed hose from the firewall end of the fuel rail and direct the hose into a suitable catch container. If you think you need to remove more than half a gallon of fuel, attach a longer hose of some kind, such as heater hose, to the end of the fuel feed hose, then direct the end of the attached hose into a large fuel can placed on the ground beside the car. Remove the fuel pump relay and install a jumper between terminals 30 and 87 in the fuel pump relay socket. I use a large paperclip bent into a U shape. Now, when you turn the key to position II without cranking the engine, the fuel pump will run and pump out any remaining water into your catch container.

If you do find that the fuel still contained water, it would be prudent to install yet another new fuel filter.

Cheers,

Don
 

Last edited by Don B; 07-20-2018 at 11:27 PM.
The following 2 users liked this post by Don B:
Lawrence (10-29-2018), mickvic (07-21-2018)
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Old 07-21-2018, 03:59 AM
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Thanks Don, I was thinking of blowing the line out but this sounds better. How is your car going what are you fixing on it lately?
 
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Old 10-29-2018, 07:59 AM
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Ive jumped the relay....tried a couple of combinations, one makes the fuel pump work but only in a bit of a dribble, should there be a strong flow??? And shes not starting, turned over a bit....but doesnt want to go....fuel pressure??
 
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Old 10-29-2018, 08:59 PM
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Originally Posted by mickvic View Post
Ive jumped the relay....tried a couple of combinations, one makes the fuel pump work but only in a bit of a dribble, should there be a strong flow??? And shes not starting, turned over a bit....but doesnt want to go....fuel pressure??
Hi mickvic,

The terminals you need to jump are numbers 30 and 87. If the fuel pump relay socket doesn't have numbers on the terminals, most of the relays do, so just match up pins 30 and 87 on the relay and put your jumper wire in the corresponding terminals in the socket. With the jumper installed and the key in position II (ON), if the fuel pump does not produce a strong stream of fuel at the fuel rail then possible explanations include low fuel in the tank, a clogged fuel filter, a kinked fuel pipe, or a failing fuel pump.

Cheers,

Don
 
 
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