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Thread: suspected fuel issue diagnosed by mechanic as faulty coil?

  1. 22nd September 2014, 03:00 PM #1
    JoeCarter Guest

    suspected fuel issue diagnosed by mechanic as faulty coil?

    Hi all, my 1998 3.9 v8 Discovery 1 conked out yesterday after a very long steep descent down Duck Creek rd. 2/3rds tank of fuel left, I could hear the fuel pump priming. When I tried some Start-Ya-Bastard in the intake it would start and run for a few seconds, sometimes longer. RACQ dude saw there were air bubbles in the fuel when he opened the schreader valve and said its likely a cracked fuel line. Got towed to a rural mechanic who left me a message saying its the coil and he's ordered a replacement. He may well be right, but if so how was it running when I squirted the Start-ya-Bastard into it? Surely even that cocktail needs a spark?
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  2. 22nd September 2014, 03:27 PM #2
    bee utey's Avatar
    bee utey
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    You say you heard the fuel pump "priming", what do you mean? The pump should (1) run for a short time after you turn on the ignition, and also (2) for a short time after you've operated the starter motor. If only (1) occurs then you've lost the ignition input to the ECU. This is a white wire with a black stripe connected to the negative side of the ignition coil, the connection may be loose. And yes, the start-ya-bastid needs a regular spark to run.

    A better explanation than a "cracked fuel line" is a burst high pressure hose connecting the fuel pump to the top plate of the pump assembly. It's very common for mechanics to replace a pump and replace the OEM plastic pressure hose with generic rubber hose. The hose will burst after a period of a few weeks and should be replaced with proper submersible fuel line such as this:

    5 16" Submersible IN Tank Fuel Line Hose SAE30R10 Specs | eBay

    $30 per foot delivered but totally the solution. Removing the pump assembly should be easy to do via an access plate under the rear load area carpet.
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  3. 22nd September 2014, 03:54 PM #3
    JoeCarter Guest
    Thanks bee utey, if the garage say the coil didn't fix it I'll pass on your suggestions. I'll update once I know.
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  4. 26th September 2014, 08:03 AM #4
    JoeCarter Guest
    Hey Bee Utey, you were right about the wire to the coil, that was the culprit. Corroded terminals and dodgy connection. Thanks again for your help.
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