NZStuart Posted August 10, 2019 Share Posted August 10, 2019 Replaced my electric pump and fitted a vacuum tank and car started first time very impressed didn't even really turn over just fired right up. But a question I fitted a fuel filter which has glass body and I can see fuel flowing and when fuel is being pumped (sucked) the car runs rough and almost stalls if idling but as soon as tank is full and vacuum shuts off idle is back to normal. Is this expected behaviour? Stuart Link to comment Share on other sites More sharing options...
Minibago Posted August 10, 2019 Share Posted August 10, 2019 More details on your system please. I am not sure how you can run the vacuum tank and an electric pump. The vacuum tank causes fuel to be drawn into the holding tank and monitored by a float providing fuel to the carburettor via gravity. fitting an electric pump provides fuel under pressure as the carburettor float lowers Any electric fuel pump would need to be under 2 psi but still not both pump and vacuum surely? Link to comment Share on other sites More sharing options...
NZStuart Posted August 10, 2019 Author Share Posted August 10, 2019 Sorry I didn't make myself clear. I removed electric pump that previous owner had installed. I sourced a vacuum tank stripped and cleaned it and then fitted to car. As I said tank seems to run fine as far as pulling petrol from the tank but engine idles rough then tank is working and refilling. Seems to suck for about 10 seconds every minute rest of time it appears fuel is being drawn from the vacuum tank until level drops and then is starts sucking from fuel tank again. Stuart Link to comment Share on other sites More sharing options...
Minibago Posted August 10, 2019 Share Posted August 10, 2019 Perhaps check the float levels in the carburettor? Link to comment Share on other sites More sharing options...
Mikefit Posted August 11, 2019 Share Posted August 11, 2019 This is normal at idle when the vacuum port is opened to draw fuel from the tank is drops the vacuum for the engine. ( like having a vacuum leak ) when the port closes then t engine returns to normal vac. You may not notice it above idle... Link to comment Share on other sites More sharing options...
nearchoclatetown Posted August 12, 2019 Share Posted August 12, 2019 What Mikefit said is true. There is a special fitting for the top of the vacuum tank where the vacuum line attaches. It has a small hole about .03 in it. DO you have that fitting? It should help with this bad idle problem. Link to comment Share on other sites More sharing options...
NZStuart Posted August 15, 2019 Author Share Posted August 15, 2019 Thanks, can't see any hole in the fitting but have some spares so I'll check them out. Link to comment Share on other sites More sharing options...
stakeside Posted August 16, 2019 Share Posted August 16, 2019 Check with Meyers at http://www.myersearlydodge.com/. here is proper fitting Link to comment Share on other sites More sharing options...
NZStuart Posted August 22, 2019 Author Share Posted August 22, 2019 Ah so its the check valve I'm missing..darn Link to comment Share on other sites More sharing options...
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