New Fuel Pump
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
New Fuel Pump
I felt that my truck was not getting enough fuel at the high end of WOT runs. I wanted to replace the fuel pump. After reading this post (LINK) by Curtis (Pocket) I decided to go with a Walbro GSL 392. Thank you Curtis for posting your findings and install tips. You saved my non-mechanical brain a lot of guess work.
I found the pump on Ebay for $118.99 with free shipping (LINK). Very fast shipping from this seller. Ordered on Friday and received on Monday.
The SOTP meter said there was an improvement. I don't have an in-cab fuel pressure gauge so I do not know what the WOT pressure was. Here are the static fuel pressure and boost readings before and after the new pump.
Stock Fuel Pump:
KOEO fuel pressure 61 PSI (I had previously shimmed the FPR)
WOT Test:
20 PSI max boost with red line connected
22 PSI max boost with red line disconnected
With Walbro GSL 392 Fuel Pump:
KOEO fuel pressure 72 PSI
WOT Test:
22 PSI max boost with red line connected
26 PSI max boost with red line disconnected
Both WOT Tests were up the same 4% grade in 80E.
I didn't do a detailed write-up because it is pretty straight forward, but here's a LINK with pics and tips on install. .
FYI - Still running stock sticks, stock turbo and stock 15° HPOP
I found the pump on Ebay for $118.99 with free shipping (LINK). Very fast shipping from this seller. Ordered on Friday and received on Monday.
The SOTP meter said there was an improvement. I don't have an in-cab fuel pressure gauge so I do not know what the WOT pressure was. Here are the static fuel pressure and boost readings before and after the new pump.
Stock Fuel Pump:
KOEO fuel pressure 61 PSI (I had previously shimmed the FPR)
WOT Test:
20 PSI max boost with red line connected
22 PSI max boost with red line disconnected
With Walbro GSL 392 Fuel Pump:
KOEO fuel pressure 72 PSI
WOT Test:
22 PSI max boost with red line connected
26 PSI max boost with red line disconnected
Both WOT Tests were up the same 4% grade in 80E.
I didn't do a detailed write-up because it is pretty straight forward, but here's a LINK with pics and tips on install. .
FYI - Still running stock sticks, stock turbo and stock 15° HPOP
Thread Starter
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Thread Starter
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Waited till today when the server seemed to be running better. 
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Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
To me it was worth the money and the 2 hours spent. I do believe the old pump was just not up to the job. Someone with more mechanical aptitude then me could do it in an hour.
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Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
Thread Starter
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Thread Starter
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
98.4k. I shimmed my FPR about 3 months ago to get from about 43 PSI to 60 PSI, KOEO. It was either a weak fuel pump or a weak spring in the FPR. I still don't really know which. But I do know the new pump is better than the old pump.
Posting Guru
Joined: Oct 2007
Posts: 2,225
Likes: 1
From: Farmington, Minnesota
I suspect a weak pump, given your results, I think the springs are what they are, I don't see them wearing out. I have 215K on mine and when I was putting the FPR housing back on 5 timies there was some tension there. There are so many varing differences in stock pressures, it has to be the pump. Anyone who has replaced the pump or done in tank pumps are putting up much better pressures.
Thread Starter
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
I suspect a weak pump, given your results, I think the springs are what they are, I don't see them wearing out. I have 215K on mine and when I was putting the FPR housing back on 5 timies there was some tension there. There are so many varing differences in stock pressures, it has to be the pump. Anyone who has replaced the pump or done in tank pumps are putting up much better pressures.
Posting Guru
Joined: Oct 2007
Posts: 2,225
Likes: 1
From: Farmington, Minnesota
I agree that I had a pump that was weaker than the new one but it took the combination of the shim and new pump to get me to 72 PSI KOEO. I just hope this new pump will also give me enough fuel volume for bigger sticks, when the time comes. It's the theory of "Supporting Mods". You have to do the little things that lead up to the bigger things.