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Post by rhysnolan on Jul 9, 2022 12:13:11 GMT
Is there a solution? If I leave my car for any period of time (over a few days), I have a hell of a job to start it again. I know I have fuel in the tank, I took out the sender to check, this time repaired it, and made a tool to re-install. I have a new pump, and all fuel lines from the tank to the pump, and then to the carb. The pump is new, but taking the fuel line off the carb I am getting no flow to the carb, and now the bowl is close to empty. Yours, a VERY frustrated owner  |
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andrew
Likes DAFs
Posts: 1,104
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Post by andrew on Jul 9, 2022 14:37:40 GMT
It's possible the fuel in the float chamber is evaporating more quickly than it should. Bear in mind Dafs were built when leaded fuel was the norm. Unleaded fuels are more volatile, so this might be a contributory factor. Another problem might be that the tank's not venting. When fuel is drawn into the carburettor the tank needs to allow air to re-enter, in order to avoid a vacuum being created. If you hear a "phump" when you remove the filler cap, this means the tank isn't venting properly.
To confirm the pump is working properly, put some fuel directly into the float chamber, remove the pipe from the pump to the carburettor and run this into a plastic container of at least a litre in size. Now, WITH THE CAR IN NEUTRAL start the engine and if necessary, rev it slightly. The engine should run for a few minutes on the fuel in the float chamber and you should have a healthy delivery of fuel into the plastic bottle. If not, the pump's at fault.
If all this is working properly, another option would be the fitting of a one-way valve in the pipe from the pump to the carburettor. This will prevent the fuel running back to the tank,via the pump.
Happy to offer more advice if needed.
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Post by dafman50 on Jul 9, 2022 18:40:06 GMT
One wY valve in line before pump.
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andrew
Likes DAFs
Posts: 1,104
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Post by andrew on Jul 10, 2022 9:26:47 GMT
It seems you are not alone with this problem. I read and contribute to a classic Renault forum and this very problem has recently been commented on by a number of contributors. I quote from a recent comment:
..modern petrols evaporate at lower temps than old stuff and bubble into the cylinders flooding them whilst leaving the carbuerretor dry when the engine is turned off whilst hot and this is often the cause of starting problems.
So it's not an uncommon problem.
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Post by bobdisk on Jul 10, 2022 9:36:26 GMT
Put a transparent fuel filter in the petrol feed to the carburettor. It should always have petrol in it. Its a good idea to have a filter anyway.
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Post by rhysnolan on Jul 12, 2022 11:33:32 GMT
Put a transparent fuel filter in the petrol feed to the carburettor. It should always have petrol in it. Its a good idea to have a filter anyway. I did have one, which became quite blocked early on, so I got another, only to discover it's made in Putin Land!  |
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Post by bobdisk on Jul 12, 2022 16:38:31 GMT
The blockage would suggest its done its job by blocking rubbish from the tank. (despite its origin!) Was the fuel low at that time? Sounds like the tank and fuel lines need to be emptied and cleaned out. When empty, take out the fuel gauge sender and inspect inside, using a torch and small mirror. You might find the inner surface coated in rust.
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Post by starider on Jul 12, 2022 23:17:00 GMT
When I bought the van, the owner had fitted an electric fuel pump, the reason being he had fitted an Alternator and could not refit the fuel pump because the alternator was in the way.I fitted a new electric pump when I replaced the alternator.The is nothing more satisfying to hear the ticking of the pump filling the float chamber when I switch on. I know there are those who say it's not original and others say the electric pumps are not reliable, but having driven many cars over the last 65 odd years, I have found them no less reliable than mechanical pumps. I suggest dafman50 has a good suggestion.
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Post by rhysnolan on Jul 13, 2022 7:59:03 GMT
The blockage would suggest its done its job by blocking rubbish from the tank. (despite its origin!) Was the fuel low at that time? Sounds like the tank and fuel lines need to be emptied and cleaned out. When empty, take out the fuel gauge sender and inspect inside, using a torch and small mirror. You might find the inner surface coated in rust. Hi Bob, if you were to look back in my "new to me" and one re taking tank in and out you will see that all of those suggestions (thank you anyway) have been done. |
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Post by andrejuan on Jul 19, 2022 17:07:36 GMT
OK, lots of good stuff to consider. I replaced a DAF fuel pump some years ago, and iirc, the rate at which it pumped fuel was determined by the number of/thickness of gaskets on the mating face?
This I think moved the lever position on the cam and increased/decreased deflection.
Hopefully someone will know for sure.
You seem to have had more than your fair share of problems with the car in the short time you have had it, I'm sure we all feel for you. The whole range is generally very reliable and trouble free if maintained correctly. Hopefully all will be well very soon.
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Post by rhysnolan on Jul 23, 2022 15:36:59 GMT
Thanks for the sympathy Andrejuan!. To be fair, some of the issues have been of my own (or people who have done work) making, eg electrics which turned out to be that the main harness was cut in the left and sill, lucky that it had not arced and caught fire on the Prescott trip!. I'm now back from a holiday in Tenerife (no thanks at all due to the inept baggage handlers at Birmingham airport who kept hundreds of people waiting for hours, including Commonwealth Games athletes).
Before going away I did a bunch more investigating. One of my things I'll need to deal with is that the fuel pick up is not quite at the bottom of the tank well, so it doesn't get the last of the fuel. While I could see fuel in the tank... DOH! That can wait till winter time when I'll pull the tank again. I'll also do a better job of the fuel line replacement job which I rushed a bit from tank to pump.
I have acquired a 1400 engine to go under the bench and steadily get that sorted for a fitting job. Yes, water pump, different pulleys on the alternator and crank, etc.
If the toy fund gets some replenishing some nice wheels are on the shopping list.
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