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Matt
Matt, Engineer
Category: VW
Satisfied Customers: 21370
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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Very gti vr6 - ran out of gas. Gas Guatemala registered over

Customer Question

Very gti vr6 - ran out of gas. Gas Guatemala registered over a quarter tank. Filled tank gauge still said just over quarter tank. Drove about 25 miles oil pressure warning light came on flashing Stop in read pulled to the side of road. Has not started since. Please help.
Submitted: 11 months ago.
Category: VW
Customer: replied 11 months ago.
Meant gas gauge not Guatemala
Expert:  Matt replied 11 months ago.

Hello

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Its 1st worth checking that the electric pump that feeds the injectors is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If you remove the filler cap to the fuel tank and listen inside while your assistant flicks the ignition you should hear it clearly

If the connections to this are corroded or damaged then the pump could stop at any time. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse, ideally measure the voltage at the pump and check its getting 12V.

You should be getting around 3 bar measured at the injector rail check to see if the plugs are getting wet indicating fuel is flowing – if not and the injectors are opening then there’s a problem with the pump or the filter or even the pressure regulator

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Customer: replied 11 months ago.
Already checked the pump is working properly and pumping gas while key is on both out of the pump and beyond the fuel filter. Have ruled out a fuel problem other than the Guage not reading correctly. More concerned with the oil pressure warning that stalled car, now that we know it is getting fuel. Can you suggest anything to test the oil pump functioning properly?
Expert:  Matt replied 11 months ago.

Hello

OK thanks for the extra information, to check the oil pressure

I'd 1st suggest measuring the actual oil pressure with separate mechanical gauge - this can be plumbed into the engine via the current pressure switch port - if you use a Teepiece you can keep the pressure switch plumbed in as well and so see if the low pressure light corresponds to a low pressure reading.

As its intermittent and you have no rumbling or rattling noises from the engine its likely to be an electrical fault so 1st check the connection to the pressure switch is bright and clean and check back along the switch wiring for any signs of damage to the insulation

As if the wire is grounded out at any point then this will also turn on the light.

if this is all OK and the oil pressure is at least 1.3Bar ( 20psi) at hot idle then replace the switch

If you do have a low pressure reading and to turn on the light it will be very low about 5psi then replace the oil pump and ensure that the pump pick up in the sump hasn't come loose or is blocked

Expert:  Matt replied 10 months ago.

Hi

do you still need help?

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