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Hi , you probably have water that's went from the tank to the pump. DIESEL PUMP. The worst thing that you can do is let your fuel go way down low and some water is taken in with fuel + water . The fuel pump is a mechanical pump with moving parts and you can't let water in . Certain pumps ,diesel pumps have a latch valve and you don't want water to sit for any length of time in the surrounding wall of the valve as it will rust this may cause the valve to stick then your car may go to rev excessive sometimes high revs , i mean screaming rev's. Please get the pump checked.
Depending on your year it could be a weak lift pump not being able to lift the fuel to the injection pump, in which case the injection pump will be quickly damaged as it relies on a steady flow of fuel to lubricate and cool it.
on older models there may be a break in the pickup line inside the tank. Suggest you keep tank above quarter full at all times until you decide what to do..replace lift pump or remove tank and check pickup......
the fuel tank may need cleaning, sediment appears to be blocking the pick up tube when tank is at quarter, or the pick up tube may be broken at that height and the system cavitates at 1/4 tank
how do you KNOW you are getting: Spark? Fuel? Air intake? Please add more details for better results or a solutions. Also add background, how was it running (or not running?) prior to this particular 5- second start? Best regards Ck
How long are you cranking for,if you have allowed to run out of fuel, it needs to be primed, try pouring diesel into the fuelfilter, but I used tohave the 110bhp AFN passat and it would start after cranking for a while and then cut out, then start but possibly cut out again, then start and give it some throttle, should be fine after that.
The "MOST EFFECTIVE
" way is to REMOVE The FUEL TANK and DRAIN it By Tipping it over to Pour From FUEL INLET HOSE. Im Sure you Dont want to Here this as it Requires Much WORK . , BUT It IS The MOST EFFECTIVE Way to EMPTY The TANK.
yes there is a low pressure pump and a high pressure(incjector pump) if your no getting fuel to engine check for low pressure pump to be working may also have air in system which is very hard to get out and a diesel wont run untill most or all air is gone
CHANGING THE FILTER ON FOUR DIESEL WILL only HELP IT-- SOUNDS AS IF YOU HAVE A FUEL SUPPLY OR CONTAMINATION PROBLEM both go through the FILTER so When Changing Filter Try to keep as Full As Possible and Pour into a GLASS Jar let it sit for 10-20 mins. Then you can see the Water (IF ANY) on TOP of the fuel, if you Find Water and Your tank is Low Top Off with DIESEL FUEL this Should Solve your Problem Fuel Filter Must Be REPLACED as Contamints can stow away in it, Bio is Good Both Ecologicly and >>CLEAN will Burn Well > FLUSHING with CLEAN DIESEL FUEL is a good Idea., A VALVE ADJUSTMENT if not performed in a long time or many miles, This can Do Wonders for Your Diesel I hope this helps you with your T L C Have a Good Day and if im Worthy RATE me Accordingly. Thank You, RejakWilson
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