Walbro 255 fuel pump issues
#31
I also don't see what a new sock would do. Unless your old one was dragged through a pile of sand.
Thoughts?
I'd rather find root cause instead of just throwing parts at it. But if there was a specific reason for the new hanger please share.
#32
Originally Posted by S2K-F8' timestamp='1366270707' post='22481926
I'm telling you guys, I had the same issue. Went through 3 different pumps (Walbro, FB, Aeromotive), 3 different dyno sessions....what resolved my problem was a new OEM pump hanger and new OEM sock filter.
Hope you get it figured out, these issues are a PITA
Scott-
Hope you get it figured out, these issues are a PITA
Scott-
I also don't see what a new sock would do. Unless your old one was dragged through a pile of sand.
Thoughts?
I'd rather find root cause instead of just throwing parts at it. But if there was a specific reason for the new hanger please share.
1st setup:
FB340 pump - stock wiring - OEM fuel rail - OEM fpr
car started going lean after 7000-7500rpm
2nd setup:
Aeromotive 340 pump - hardwired w/relay off battery - AEM fuel rail - AEM fpr - fuel pressure gauge
no difference except we could watch fuel pressure drop on the gauge once it hit 7000-7500rpm
3rd setup:
Walbro 255 pump - hardwired - new OEM pump hanger - new OEM sock filter - new fuel hose between pump and hanger - new fuel line specific clamps on hose - AEM fuel rail - AEM fpr - fuel pressure gauge
fuel pressure finally rose and pulled all the way to redline
So can I narrow it down to just the pump hanger - no.....but changing out the pump hanger, new sock filter, new fuel line and hose clamps is still cheaper than another failed attempt on the dyno.
Scott-
#33
IIRC there is an internal (non replaceable) screen filter inside the pump hanger. The sock filter I did because it's cheap and eliminates one more variable. Honestly I was grabbing at straws trying to figure out what was causing my fuel pressure drop. Here's what I went through (91pump gas, ID1000's, K-Pro, 12psi):
1st setup:
FB340 pump - stock wiring - OEM fuel rail - OEM fpr
car started going lean after 7000-7500rpm
2nd setup:
Aeromotive 340 pump - hardwired w/relay off battery - AEM fuel rail - AEM fpr - fuel pressure gauge
no difference except we could watch fuel pressure drop on the gauge once it hit 7000-7500rpm
3rd setup:
Walbro 255 pump - hardwired - new OEM pump hanger - new OEM sock filter - new fuel hose between pump and hanger - new fuel line specific clamps on hose - AEM fuel rail - AEM fpr - fuel pressure gauge
fuel pressure finally rose and pulled all the way to redline
So can I narrow it down to just the pump hanger - no.....but changing out the pump hanger, new sock filter, new fuel line and hose clamps is still cheaper than another failed attempt on the dyno.
Scott-
1st setup:
FB340 pump - stock wiring - OEM fuel rail - OEM fpr
car started going lean after 7000-7500rpm
2nd setup:
Aeromotive 340 pump - hardwired w/relay off battery - AEM fuel rail - AEM fpr - fuel pressure gauge
no difference except we could watch fuel pressure drop on the gauge once it hit 7000-7500rpm
3rd setup:
Walbro 255 pump - hardwired - new OEM pump hanger - new OEM sock filter - new fuel hose between pump and hanger - new fuel line specific clamps on hose - AEM fuel rail - AEM fpr - fuel pressure gauge
fuel pressure finally rose and pulled all the way to redline
So can I narrow it down to just the pump hanger - no.....but changing out the pump hanger, new sock filter, new fuel line and hose clamps is still cheaper than another failed attempt on the dyno.
Scott-
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
#34
Thanks for the info Scott. If there is an internal screen filter inside the hanger that would start to make some sense of the consistency of the pressure drop.
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
I just went out to my car and looked....looks like I went 8gauge from the battery (which is in my trunk) to the relay. Then out of the relay looks like 12gauge to the pump hanger (short run, maybe 4-5". I depinned the stock wire, so the 12gauge wire goes into the connector.). Nothing done inside the hanger itself. (hope that makes sense)
#35
Originally Posted by C63AMG' timestamp='1366310111' post='22483119
Thanks for the info Scott. If there is an internal screen filter inside the hanger that would start to make some sense of the consistency of the pressure drop.
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
I just went out to my car and looked....looks like I went 8gauge from the battery (which is in my trunk) to the relay. Then out of the relay looks like 12gauge to the pump hanger (short run, maybe 4-5". I depinned the stock wire, so the 12gauge wire goes into the connector.). Nothing done inside the hanger itself. (hope that makes sense)
#36
Originally Posted by S2K-F8' timestamp='1366311488' post='22483207
[quote name='C63AMG' timestamp='1366310111' post='22483119']
Thanks for the info Scott. If there is an internal screen filter inside the hanger that would start to make some sense of the consistency of the pressure drop.
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
Thanks for the info Scott. If there is an internal screen filter inside the hanger that would start to make some sense of the consistency of the pressure drop.
When you say hardwired, do you mean direct from the pump connector through the hanger plate bypassing the internal and external connector on the hanger? I'm asking for clarification because some still splice into the OE wiring as close to the external hanger connector as possible which "should" be fine since it cuts the length of the smaller gauge wire down to a few inches.
EDIT: Can you confirm the part numbers you ordered for the hanger and sock or point to them from the below link?
http://www.rchondaparts.com/parts-ca...fuel/fuel-tank
Hanger = 16010-S84-A01 FILTER SET, FUEL
Sock = 17516-S2A-930 FILTER SET, FUEL PUMP
Given the name of the Hanger part it may confirm the theory of an internal screen filter.
I just went out to my car and looked....looks like I went 8gauge from the battery (which is in my trunk) to the relay. Then out of the relay looks like 12gauge to the pump hanger (short run, maybe 4-5". I depinned the stock wire, so the 12gauge wire goes into the connector.). Nothing done inside the hanger itself. (hope that makes sense)
[/quote]
Yes, that sounds correct!
#37
Cheers! I will try a new hanger and use the new sock from the AEM pump. But, just for added precaution I'll take it one step further and skip the internal connections inside the hanger and route the wires from the AEM pump connector through the hanger plate.
I'll have to wait a bit for some parts so I will update in a few weeks.
I'll have to wait a bit for some parts so I will update in a few weeks.
#38
Originally Posted by S2K-F8' timestamp='1366312667' post='22483253
Yes, that sounds correct!
I'll have to wait a bit for some parts so I will update in a few weeks.
#39
Originally Posted by C63AMG' timestamp='1366313154' post='22483280
[quote name='S2K-F8' timestamp='1366312667' post='22483253']
Yes, that sounds correct!
Yes, that sounds correct!
I'll have to wait a bit for some parts so I will update in a few weeks.
[/quote]
Yeah I ordered one. Looking at the shape of the AEM it looks like it will interfere with the float.
#40
Originally Posted by S2K-F8' timestamp='1366314193' post='22483334
[quote name='C63AMG' timestamp='1366313154' post='22483280']
[quote name='S2K-F8' timestamp='1366312667' post='22483253']
Yes, that sounds correct!
[quote name='S2K-F8' timestamp='1366312667' post='22483253']
Yes, that sounds correct!
I'll have to wait a bit for some parts so I will update in a few weeks.
[/quote]
Yeah I ordered one. Looking at the shape of the AEM it looks like it will interfere with the float.
[/quote]
I hope this solves your issue as it did mine....keep me posted