posted by
someone claiming to be PETIBOY
on
Thu Apr 28 23:41 CST 2005 [ RELATED]
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Hello folks,
I own a 1993 940 Turbo Wagon it seems either my fuel in tank pre pump or main pump is on its way out. In this model year, do I only have the main pump installed on this vehicle or both.
Thanks
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What are your symptoms?
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90 244DL 252K - original engine/drivetrain :)
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posted by
someone claiming to be petiboy
on
Fri Apr 29 04:17 CST 2005 [ RELATED]
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Just had my fuel filter changed and the idle is going up & down. There seems to be a significant whining & chirping from the fuel pump area. Also when you turn the key the sound is sickly, not the way it used to sound like a low hum. Other than that everything else seems to be fine but I dont want to get stuck on the road.
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This is a stupid question, but they did install it pointing the correct direction?
I think it only goes on one way, so that's probably impossible
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Volvo #6: all wagons.... 1972 145S, 1976 245 DL, 1983 245 GL, 1986 740 GLE, 1990 740 GL, now a 1995 940...
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Was the idle going up and down before the filter change? Did that change anything?
Are the symptoms worse when there less a 1/2 tank of gas? A classic bad pre-pump symptom!
A noisy main pump can sometimes be caused by a worn pre-pump. It is very rare for a Volvo main pump to go, more likely to be you pre-pump. BTW - Even if your pre-pump goes the car should still run. The main, that's a different story...
Here is a URL from the 700/900 FAQ fuel section. Check it out, it's pretty educational.
http://www.brickboard.com/FAQ/700-900/FuelSystem.htm
Below is a quote from that 700/900 FAQ that might be insightful. Note the last sentence...
"Symptoms of worn fuel pre-pump: My experience with a worn fuel pre-pump is that it will cause the engine to miss and lose power under conditions of high flow (high throttle and high rpm). The problem grew worse very gradually (over 10's of 1000's of kms). It certainly wasn't going to leave me stranded anywhere. [Another example:] My wife drives an '83 760, which I have maintained as needed. Recently, the car started to vapor-lock in warmer weather, and/or when the fuel level dropped to around a 1/4 tank or lower. Oddly enough, when I refill the tank, the problem seems to go away. [Test Tip:] As far as a definitive test goes, I guess it would be necessary to set up a pressure gauge and flow meter as well as a valve in the circuit that would allow a specified volume to flow while reading pressure, but see the above fuse and noise procedure for an alternative. [Editor] Hard starting and poor idle have been traced to a bad pre-pump, if other symptoms are also present such as main pump noise."
G'luck!
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90 244DL 252K - original engine/drivetrain :)
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There is always the possibility the pre-pump is fine and it is just the pre-pump hose that is leaking. Typical of 240's but also possible in 700/900's (I think age is the determining factor and the 700/900 models are now hitting the time mark for this to be a more common problem), the short rubber hose that is used to mate the pre-pump outlet to the fuel sender will develop a leak. Typical symptom is starving for gas when the tank gets to less than 1/2 full. Actually, all the symptoms attributable to a bad pre-pump would be true for the bad hose, the bigger the hole, the more pronounced.
I have never had a pre-pump fail in my fleet going back to the '84 models. My "pre-pump failures" have always been traced to the in-tank pre-pump hose ($4.00 at FCP Groton). Easy repair, replace the pick-up sock and fuel sender gasket while you are at it.
Bob K
'94 945T (daughter co-opted it for college, used to be mine)
'99 S80 (mom-in-law's)
'88 240DL (son's)
'84 242Ti (for sale)
'89 560SL (wifemobile)
'88 300TE (my commuter)
'68 GT500KR (future commuter/under restoration)
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Yeah, a friend of mine had the small hose fail on his older 740. Common problem.
When the sending unit metal pipes rusted out on my 240 (another issue to look for as Volvos age), I replaced small hose, sock and the pre-pump in addition to the sending unit and gasket while I was in there. My theory was do it all now as I didn't want to go back in there again!!
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90 244DL 252K - original engine/drivetrain :)
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*that* was the missing part. A short hose was missing on the sender aparratus that I got from the junkyard. Funny as the aparratus is around $500.00 from Volvo, but it was only $15.00 from the yard with the little $4.00 hose missing.
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Volvo #6: all wagons.... 1972 145S, 1976 245 DL, 1983 245 GL, 1986 740 GLE, 1990 740 GL, now a 1995 940...
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Boy, that single pump setup is really expensive! Glad I have the 2 pump setup. Even the main pump for a 240 is only about $250+.....
Not to rub it in, but my new pre-pump from FCP Groton was about $30.
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90 244DL 252K - original engine/drivetrain :)
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Well, in my case, the level sender had conked out and volvo told me (and my mechanic) that the sender was $250.00, but that because of an upgrade in design, I'd have to buy both pump and aparratus for a total of $500.00. I found a junk aparratus for $15.00 and used it as a model to repair my stock unit. The junk unit was missing a short section of hose. I was curious as to why someone would take that cheap little hose and leave the much more valuable sender unit (it was the only one in the whole junkyard).
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Apparently someone needed just that small hose, eh...
$15 for a sending unit is a steal. Especially when a new one costs $250! I had read here that the parts for a 940 with the single pump are expensive, but $500 for the new, improved design sounds like a ripoff to me. You did the right thing rebuilding yours.
Maybe I should have thought about getting a used sending unit for my 240 when the fuel pipes rusted out. They are about $95 new. OTOH - The newest 240 is now 12 years old so any used one here in N.E. is probably rapidly disintegrating!!
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90 244DL 252K - original engine/drivetrain :)
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Dear Petiboy,
May this find you well. According to the Volvo Pocket Data Booklet: Cars - 700,850,900 (1991-1996), Turbo-equipped cars have Bosch fuel injection. As a result, you will have an in-tank pre-pump and an external main pump.
The external (main) pump is mounted on a bracket,attached to the underside of the floor pan, under the driver's seat. The fuel filter is right next to it.
If you need to change the main pump, first disconnect the negative battery cable clamp from the batter, and put the clamp into a plastic bag. This ensures that any banging needed to remove the main pump, will not trigger the airbag, the sensor for which is mounted on the floor pan, inside the car, under the driver's seat, above the externally-mounted main fuel pump.
Have you checked the fuel pressure, at the Schrader (bicycle-type) valve, on the underside of the fuel rail. The pressure should read 43 pounds/square in. Also, when was the fuel filter last changed? A clogged filter can degrade performance.
Hope this helps.
Yours faithfully,
spook
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I believe that this info is not totally accurate. My 1995 945T with Bosch LH2.4 only has an intake pump. The bracket under the car houses only a fuel filter.
Chris
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My 1995 8-valve 945 also has only one pump and it's in the tank. Since it's a bosch injection, I was kinda surprised when I changed the filter and discovered that there was no pump under there... One less part to go wrong I guess.
(Not to jump on the spook-was-wrong-bandwagon) I just wanted to mention that the same is true of the non-turbos 95 940s. It's rather weird actually...
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Volvo #6: all wagons.... 1972 145S, 1976 245 DL, 1983 245 GL, 1986 740 GLE, 1990 740 GL, now a 1995 940...
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Dear Chris,
Good p.m. and may this find you well. With Volvo, there's always an exception, that proves the rule.
Thank you for supplying it. I didn't know, who would step forward.
That said, I might have won a Nobel Prize, for having made an absolutely correct statement about a Volvo absolute!!
Enjoy the weekend.
Yours faithfully,
spook
p.s. Under the Rex/Regina section of the Volvo Pocket Data booklet, there are no data for B230FT engines.
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