"whatuptkhere" (whatuptkhere)
05/23/2018 at 19:00 • Filed to: fuel economy, volvo, 740 turbo, fuel
0
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"whatuptkhere" (whatuptkhere)
05/23/2018 at 19:00 • Filed to: fuel economy, volvo, 740 turbo, fuel | 0
| 9 |
So I’ve been struggling with fuel economy problems for months now.
After I changed the transmission filter in my Volvo 740 Turbo, I went from getting 11.5L/100km to 15L/100km over a whole tank.
I’ve been investigating a lot of things, but obvious answers like “oxygen sensor” or “coolant temp sensor” haven’t panned out.
The story thickens.
Yesterday, I topped off the tank. Right to the top. I drove 16km.
I woke up today to see the fuel gauge had moved significantly. I go straight to the petrol station, and manage to put 5.82 litres in the tank.
Something highly strange appears to be going on. I suspected siphoning for a while but I’ve got a locking fuel cap on the car. Perhaps this could be picked but it seems like a long shot. What could it be? Leaky injector?! I’m seriously stressing out at this point.
One factor that I’ve not yet mentioned is that when I changed the transmission filter and was taking the car off its jack stands, I accidentally lowered the car down improperly such that a ramp got jammed under the fuel tank and I had to jack the whole car up to get it out. My next area of investigation will be for leaks around the fuel tank area tonight.
Any help is very appreciated. Driving me mad, this car.
farscythe - makin da cawfee!
> whatuptkhere
05/23/2018 at 19:09 |
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have you checked the oil pan?
(eta) coz of leaky fuel injector
(double eta)... oh i missed the part where you said that... yeah.. check that
sony1492
> whatuptkhere
05/23/2018 at 19:16 |
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Id suspect it’s leaking leaking, if the motor had 5 liters of fuel leak into itself you would notice it in the oil.
Also turn the car on and see if fuel is spraying out of any fittings
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whatuptkhere
> farscythe - makin da cawfee!
05/23/2018 at 19:19 |
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Good idea, I’ll check the oil.
Is the test to just smell it and see if it smells like petrol, or?
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farscythe - makin da cawfee!
> whatuptkhere
05/23/2018 at 19:22 |
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if the oil smells strongly of petrol... thats a problem
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farscythe - makin da cawfee!
> whatuptkhere
05/23/2018 at 19:26 |
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http://dannysengineportal.com/gas-getting-into-oil/
just incase your oil does smell like petrol
splains everything better than i can
Rust and Dust - Oppositelock Forever
> whatuptkhere
05/23/2018 at 19:53 |
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I’m leaning towards the ramp getting pinned by the tank causing your problem. May have pinned fuel lines into the floor/cut lines/somehow caused a leak at the sending unit.
Do you have an access port under the back seat to get to the sending unit? May be an easy way to get a peek without having to drop the tank.
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whatuptkhere
> Rust and Dust - Oppositelock Forever
05/23/2018 at 20:02 |
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Yes, I’ll check that out tonight!
This is my top theory as well; the one thing that bothers me about it is that I can’t smell gas and there’s no obvious leaking going on. You’d think if I lost 3L over night there’d be a puddle or something somewhere.
Swear to god if someone’s siphoning me...
Die-Trying
> whatuptkhere
05/23/2018 at 22:29 |
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you might crawl under the car to see if someone has put a hole in the bottom of your tank, and is just draining some out when they need some....... be looking for a screw or bolt...... or look for a cut/missing clamp in the filler neck hose......
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whatuptkhere
> Die-Trying
05/23/2018 at 23:13 |
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I’ll have a look, never thought of that. Thanks!