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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Bringing a 740 back to lifeViews : 23620 Replies : 240Users Viewing This Thread : |
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Mar 21st, 2021, 10:50 | #31 | |
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Mar 21st, 2021, 11:52 | #32 | |
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It’s low according to the needle, right at empty. I did put a 5l Jerry can in the car yesterday. But I’ll add another 5l in the week |
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Mar 21st, 2021, 12:40 | #33 |
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If the in-tank pump isn't working that might not be helping. Really needs to be above ~1/4 so the main pump has a chance of pulling some fuel through, often with a dodgy in-tank pump, as long as the level is above 1/4 the main pump will manage to pump fuel.
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Mar 24th, 2021, 07:08 | #34 | |
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I'll also get underneath and check the pump and filter again to make sure they are all connected correctly. I think they only go one way due to the size of the bolts either side of the fuel filter but will confirm. As a quick test, I might reconnect the old fuel pump and see if the new one is faulty? Changing the relay defiantly made the pump switch on so the new one might have a fault. Worth checking I suppose. Last edited by Challo; Mar 24th, 2021 at 09:08. |
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Mar 24th, 2021, 10:35 | #35 |
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Has to be worth a go - out of curiosity, when you replaced the main pump was fuel flowing out of the inlet pipe while you were swapping them over?
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Mar 24th, 2021, 10:47 | #36 |
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Yes. When I first changed the fuel pump / filter there was some fuel in the pipe and filters that needed to be drained out. When I had to take it apart again due to missing the brass crusher washers again fuel was coming out the pipe and I had to drain both the filter and pump due to them having fuel in them.
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Apr 2nd, 2021, 13:13 | #37 |
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Finally got time today and got the car started. Changed the fuel pump back to the original one and it fired up. Need to contact PFS on the faulty pump.
Once started it’s really lump, and when rev the you can hear a belt screeching. The timing belt has been changed, but unclear on any of the others. With no revs it barely ticks over, checked the fresh plugs and they are black. I have added a photo. Also there appears to be some oil deposits out of the exhaust. Attached photos I did check the spark plugs I bought and the gapping is all wrong. They are about .4 rather than .7 |
Apr 2nd, 2021, 13:52 | #38 | |
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That screeching belt is likely to be the alternator drive belt(s), probably slipping because it's too loose or the pulleys have gained some surface rust which is preventing good friction. Wait until it's completely cold again and try restarting, the AAV (Auxiliary Air valve) should open by then but it closes with ignition on. Chances are if the "new" pump wasn't delivering enough pressure the mixture would have been too weak to fire so any fuel it did inject would remain unburned. Your PCV system may also be blocked which would make it richer and slower. No photos on your post, given the fact it has had unburned fuel through the exhaust i'd expect the tailpipe to look oily. Suggest you clean the plugs, regap them to 0.65mm or 0.025", depending on your feeler guages (post a photo of them if unsure), check your PCV breather system for any and all blockages and clean it if necessary (almost certainly will be and no harm in doing it even if you're not sure), check your air filter for cleanliness and maybe even disconnect the concertina'd aluminium heat tube from the exhaust manifold to air box at the air box end. Then try it, run it up to temperature and see what it's doing then.
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Apr 3rd, 2021, 14:19 | #39 | |
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I did take a look at the PCV box, and it looks pretty grim. The pipe look past their best, and also it appears there has been some bodges to fix holes on the connections to other pipes. Lots of sticky black stuff. Best bet is to order a new box and the replacement pipes. I do need to degrease the engine as well though. Lots of old oil all around the block from previous leaks, and no doubt from a blocked PCV. Will clean it up and see what other leaks I can find. I have a attached a photo from underneather the car of what looks like the sump? Its covered in oil so I suspect the pipe or connector has failed? Does anyone know what this is called? Plan is to book it in for an MOT and and see how it performs. Will give me an idea on whats next to fix. |
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Apr 3rd, 2021, 14:48 | #40 | |
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Pull fuse #1 for 30 seconds or so then refit before you next start it - that will clear any historic faults that might have put it into Limp Mode. ***EDIT*** Have a read of this, gives you more of an idea on the PCV system on yours : https://blog.fcpeuro.com/the-rwd-vol...plete-overview
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ Last edited by Laird Scooby; Apr 3rd, 2021 at 14:51. Reason: PCV Link |
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