Help!! 1981 244dl fuel pump still buzzing after replacement!

FJFJFJ · Feb 9th, 2013, 23:15

I need help here. I have a 1981 DL 244. Just changed out the INTANK fuel pump. Still buzzing noisy INLINE pump. I checked the pressure. I changed the fuel filter. I checked the fuses, changed the fuses. I just changed the INLINE pump last night with a good bosch. The INTANK pump also a Volvo OEM part that they sold me. STILL, STILL, I am hearing a loud buzzing noise coming from my NEWLY installed INLINE PUMP. I have listened to make sure the INTANK PUMP is running. It is. Has anyone had this problem before? If I replace the FUEL PRESSURE ACCUMULATOR will that solve the BUZZING NOISE coming from the INLINE PUMP? I have checked the FEED LINE going from the INTANK to the INLINE. All clear. I changed the INTANK PUMP rubber hose that you guys know sometimes corrodes. WHAT THE HECK DO I DO NEXT. There is HESITATION ALSO when I go over a speed bump, hesitation when I go from a stop sign. Slight but still there like when the buzzing first started last week. Thanks for any help from you GURU'S. FJFJFJ

DW42 · Feb 10th, 2013, 21:00

You didn't mention changing the fuel pump relay. Does the buzzing stop if you put a jumper wire between fuses #5 and #7? This bypasses the relay. If the relay is at fault, I believe it's a green relay behind the passenger-side footwell. It would be useful to be able to rule out a dying fuel pump relay.

JonC · Feb 19th, 2013, 03:32

I think the buzzing happens when the intank pump isn't supplying enough pressure to the main pump. That might explain the hesitation too. If its not the relay circuit I'd check the voltage across the intank pump next.

crusty coupe · Feb 19th, 2013, 22:05

Under car main pumps get noisey when pre pumps (in tank) fail and the tank fuel level is low. e.g. third to quarter of a tank left.
By topping the tank level up to half or more can cure the noise as gravity takes the strain from the main pump, some cars have run for years with failed pre pumps and the main pump has rumbled on !
If the pumps are both new then you may have feed problem with the pre pump, never aware of the fuel pump relay causing this issue, then tend to fail so causing a non start or fail to re-start when car is warm.
Not unheard of for a new part to be faulty too, but rare.

Jim

Clifford Pope · Feb 20th, 2013, 07:59

Are you sure there aren't any pinholes in the steel pipe at the top of the in-tank assembly? It's notorious for rusting, and often collapses completely when you try to get the rubber pipe off.

JonC · Feb 23rd, 2013, 02:20

The fuel pumps also grounded through that pipe and thru the tank to the chassis. Might be worth checking resistance between the pipe and a good ground.
I gotta say that does sound like a tenuous route but I'm pretty sure that's how it's grounded..

Feb 9th, 2013, 23:15	#1
FJFJFJ New Member Last Online: Feb 10th, 2013 00:35 Join Date: Feb 2013 Location: temecula	Help!! 1981 244dl fuel pump still buzzing after replacement! I need help here. I have a 1981 DL 244. Just changed out the INTANK fuel pump. Still buzzing noisy INLINE pump. I checked the pressure. I changed the fuel filter. I checked the fuses, changed the fuses. I just changed the INLINE pump last night with a good bosch. The INTANK pump also a Volvo OEM part that they sold me. STILL, STILL, I am hearing a loud buzzing noise coming from my NEWLY installed INLINE PUMP. I have listened to make sure the INTANK PUMP is running. It is. Has anyone had this problem before? If I replace the FUEL PRESSURE ACCUMULATOR will that solve the BUZZING NOISE coming from the INLINE PUMP? I have checked the FEED LINE going from the INTANK to the INLINE. All clear. I changed the INTANK PUMP rubber hose that you guys know sometimes corrodes. WHAT THE HECK DO I DO NEXT. There is HESITATION ALSO when I go over a speed bump, hesitation when I go from a stop sign. Slight but still there like when the buzzing first started last week. Thanks for any help from you GURU'S. FJFJFJ

Feb 10th, 2013, 21:00	#2
DW42 Senior Member Last Online: Oct 9th, 2022 04:41 Join Date: Feb 2011 Location: Currumbin, Queensland	You didn't mention changing the fuel pump relay. Does the buzzing stop if you put a jumper wire between fuses #5 and #7? This bypasses the relay. If the relay is at fault, I believe it's a green relay behind the passenger-side footwell. It would be useful to be able to rule out a dying fuel pump relay. __________________ Present: 1990 240GL saloon, 1992 240 estate Past: 1988 240GL; 1971 144DL; 1972 145DL

Feb 19th, 2013, 03:32	#3
JonC Junior Member Last Online: Oct 2nd, 2016 16:40 Join Date: Mar 2012 Location: North Carolina, USA	I think the buzzing happens when the intank pump isn't supplying enough pressure to the main pump. That might explain the hesitation too. If its not the relay circuit I'd check the voltage across the intank pump next. Last edited by JonC; Feb 19th, 2013 at 03:34.

Feb 19th, 2013, 22:05	#4
crusty coupe Junior Member Last Online: Jul 12th, 2022 07:12 Join Date: Nov 2010 Location: exeter	240 fuel pump Under car main pumps get noisey when pre pumps (in tank) fail and the tank fuel level is low. e.g. third to quarter of a tank left. By topping the tank level up to half or more can cure the noise as gravity takes the strain from the main pump, some cars have run for years with failed pre pumps and the main pump has rumbled on ! If the pumps are both new then you may have feed problem with the pre pump, never aware of the fuel pump relay causing this issue, then tend to fail so causing a non start or fail to re-start when car is warm. Not unheard of for a new part to be faulty too, but rare. Jim

Feb 20th, 2013, 07:59	#5
Clifford Pope Not an expert but ... Last Online: Yesterday 08:24 Join Date: Dec 2001 Location: Boncath	Are you sure there aren't any pinholes in the steel pipe at the top of the in-tank assembly? It's notorious for rusting, and often collapses completely when you try to get the rubber pipe off.

Feb 23rd, 2013, 02:20	#6
JonC Junior Member Last Online: Oct 2nd, 2016 16:40 Join Date: Mar 2012 Location: North Carolina, USA	The fuel pumps also grounded through that pipe and thru the tank to the chassis. Might be worth checking resistance between the pipe and a good ground. I gotta say that does sound like a tenuous route but I'm pretty sure that's how it's grounded..

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