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Problems after fuel filter replacement

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
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misha
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Problems after fuel filter replacement

Post by misha » Wed Sep 18, 2019 1:17 pm

A month ago i replaced fuel filter because it was time for it.
Replacement was Bosch filter.
From the 1st day after replacement i have problems with starting when car sits overnight.
The problem is that car is cranking much longer and sometimes won't start at 1st attempt.Second try...it starts instantly.

Before replacement car was always starting on 1st-2nd crank no mather how long it sits.

It seems that priming few times before starting doesn't improve things...so i ruled out bad check valve.....also no leaks.

The only thing that was touched was fuel filter and the problem was there in the first morning after replacement.

Note that on 2nd try it start instantly!

Anybody had similiar experience?


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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jreed
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jreed

Re: Problems after fuel filter replacement

Post by jreed » Thu Sep 19, 2019 5:31 am

I haven't had a similar experience, but I also haven't tried the Bosch brand fuel filter. The current filter I'm using on my '97 850 is a Mahle brand. Before that, I used a Volvo OEM filter. No problems with those.


1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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erikv11
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erikv11

Re: Problems after fuel filter replacement

Post by erikv11 » Thu Sep 19, 2019 7:35 am

Nor do I have any suggestions but I've always used Bosch fuel filters, probably put 8 of them on P80 cars.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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misha
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Re: Problems after fuel filter replacement

Post by misha » Thu Sep 19, 2019 10:22 am

In the past i used Knecht(Mahle) and Delphi(should be Ac Delco in U.S).
This is the 1st time i used Bosch fuel filter in 850.
Although... i have it on Xm and have no problems with it.

The thing which drives me nuts is that problem appeared from the 1st day i installed it.
I can't re-install the old one just to see if problem will go away because i threw it away.

If there is a pressure leak overnight at "quick connections" at fuel filter i assume that there would be a leak.But there are no leaks or fuel smell.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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jreed
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jreed

Re: Problems after fuel filter replacement

Post by jreed » Fri Sep 20, 2019 5:14 am

Have you tried testing for fuel pressure at the fuel rail? It could be there is an air bubble in the fuel rail that prevents starting the first time. If you open up the Schrader valve at the end of the fuel rail, you could see if fuel spurts out right away or if there is an air bubble. Be sure to wear safety glasses, gloves and have a rag handy to capture the fuel. Good luck!


1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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misha
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Re: Problems after fuel filter replacement

Post by misha » Fri Sep 20, 2019 5:57 am

Fuel system is self-bleeding.
Fpr is there to maintain fuel pressure and excess fuel is returned into the tank via return line.
So....no air lock is possible.
Even if there was some kind of air lock at first....it was eliminated after priming before start.
No driveablilty issues,idle is smooth and even,all hp is available in every rpm range....problem is just 1st start after it sits overnight.
2nd attempt....it starts instantly.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Chuck W
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Chuck W

Re: Problems after fuel filter replacement

Post by Chuck W » Fri Sep 20, 2019 6:55 am

You know more about the Motronic M4.4 than I do, I imagine, but is there a chance that the ECU adjusted starting parameters based on fuel delivery with the old filter? Would an ECU reset help?



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misha
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Re: Problems after fuel filter replacement

Post by misha » Fri Sep 20, 2019 11:35 am

It shouldn't.
M4.4 don't have insights or control on fuel pressure like Me7 cars.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Chuck W
Posts: 188
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
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Been thanked: 19 times
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Chuck W

Re: Problems after fuel filter replacement

Post by Chuck W » Fri Sep 20, 2019 11:56 am

I guess I should've specified fuel trim and not necessarily fuel pressure.

I've only recently started messing with M4.4 tuning/flashing, so I'm still learning details here and there.



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misha
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Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
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misha

Re: Problems after fuel filter replacement

Post by misha » Fri Sep 20, 2019 2:42 pm

No... fuel trim should not be affected with fuel filter replacement.
Even if it was.....after a month it should be addapted...since fuel trims are changing while driving and stored every time you turn the engine off.
I'll investigate those "quick connections" at fuel filter.
Those are the only items which were disturbed in the process of fuel filter replacement.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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