91 Volvo 740 stalled on freeway and won't start!
#22
#23
May as well check the water pump while you have the pump off, be careful with the plastic cover.
#24
Thanks pierce, I've been looking at videos and step-by-step instructions. I might try to do it myself because the mechanic is trying to charge me $300 which sounds too much. I've have this step-by-step instructions but it's for a turbo.
740 timing belt
Will I be able to use these instructions for my non-turbo 740? Thanks everyone
740 timing belt
Will I be able to use these instructions for my non-turbo 740? Thanks everyone
#26
#28
#29
#31
Can you explain the reason for having (2) pumps? Besides double the money to spend when something fails...
On other makes of cars (and trucks), I have replaced the dual-pump setup with a single pump with great success.
On other makes of cars (and trucks), I have replaced the dual-pump setup with a single pump with great success.
note that the main pump will be quite noisy if the in-tank pump isn't working. under those conditions, my 92 740T ran OK with more than 1/2 tank, but below 1/3rd tank it would stumble under heavy throttle. replaced the intank pump and main pump is quiet as it should be, smooth and happy.
#32
Did you ever wonder why these cars last so long? Volvo tends to overbuild things. The in-tank pump reduces the wear & tear on the main pump which provides pressure to the fuel rail. It is rather inexpensive as compared to the main pump as well and if kept in good running condition, the main pump lasts a good long time. My '90 has the original main pump and it is still very quiet and the car has 240k miles on it.
#33
Hot weather can cause too much work on the external main pump (especially when the tank is low) to get the fuel over the hump. That is why all the models since have only 1 main pump that is located in the tank.
#34
That didn't answer my question, and I am well aware of how well-built these cars are. I've owned many in my life.
So to be more specific, comparing the internal fuel pump with the external pump...what are the fuel deliver specs on each? I haven't been able to find those numbers to compare. I did, however, find some specs on a replacement in-tank fuel pump.
So to be more specific, comparing the internal fuel pump with the external pump...what are the fuel deliver specs on each? I haven't been able to find those numbers to compare. I did, however, find some specs on a replacement in-tank fuel pump.
Did you ever wonder why these cars last so long? Volvo tends to overbuild things. The in-tank pump reduces the wear & tear on the main pump which provides pressure to the fuel rail. It is rather inexpensive as compared to the main pump as well and if kept in good running condition, the main pump lasts a good long time. My '90 has the original main pump and it is still very quiet and the car has 240k miles on it.
#35
I was answering that question.
For the main pump, it delivers somewhere around 50-55 psi. For the in-tank pump, I don't think the pressure spec is as important as how much fuel it can deliver. I do know that the injectors - when open - deliver around 320 cc/min ('90s LH 2.4). You could compute out what flow that equates to and add tolerance.
You might want to try the turbobricks forum as they really get into the technical details of fuel delivery.
For the main pump, it delivers somewhere around 50-55 psi. For the in-tank pump, I don't think the pressure spec is as important as how much fuel it can deliver. I do know that the injectors - when open - deliver around 320 cc/min ('90s LH 2.4). You could compute out what flow that equates to and add tolerance.
You might want to try the turbobricks forum as they really get into the technical details of fuel delivery.
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Chowat
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rquinonez32
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12-08-2011 10:49 PM