Change that fuel pump!
Oct 25, 2003, 10:29 PM
#31
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Originally posted by timzcat
As usual Silver Surfer, nice technical post.
I was just on the Dyno today and experienced detonation at 5000 RPMs that caused a dip in the graph. Naturally, the detonation was tuned out by the dip still exists. From Al's experience this is related to ****ty gas. I'd be interested to see how the fuel pump would affect the dip though. It is not noticable at all, just shows up on the dyno.
As usual Silver Surfer, nice technical post.
I was just on the Dyno today and experienced detonation at 5000 RPMs that caused a dip in the graph. Naturally, the detonation was tuned out by the dip still exists. From Al's experience this is related to ****ty gas. I'd be interested to see how the fuel pump would affect the dip though. It is not noticable at all, just shows up on the dyno.
Also - we were able to add in lots of fuel - it was just the fact that we had to pull some timing and put in more fuel to get it to run clean in that area that was the issue. Just too bad it was hitting the detonation at that point b/c the rest of the curve was totally quiet. I was happy that you can't feel the spot you see on the dyno and we had it totally detonation free!
I'm NOT looking forward to doing a dyno day in LA - I am spoiled by 94 octane fuel we have in CT and can't imagine how much power we will have to cut on modified cars with 91 octane - (its bad enough how much fuel we have to add in out through the mail 91 octane map!)
Oct 25, 2003, 10:30 PM
#32
I have to agree that the Fuel pump upgrade is a good idea.. With the cooler weather, I found I was getting intermittant detonation with ONLY a turbo back exhaust and open air filter.. I was wracking my brain looking at things that could have been causing it and came to the conclusion (without adequate instrumenation its tough) that it was fuel cut or not enough fuel volume under certain circumstances. I will certainly attempt to upgrade the pump in preparation for other modifications, so if it goes away, then I'll know.
Oct 25, 2003, 10:36 PM
#33
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Originally posted by MalibuJack
I have to agree that the Fuel pump upgrade is a good idea.. With the cooler weather, I found I was getting intermittant detonation with ONLY a turbo back exhaust and open air filter.. I was wracking my brain looking at things that could have been causing it and came to the conclusion (without adequate instrumenation its tough) that it was fuel cut or not enough fuel volume under certain circumstances. I will certainly attempt to upgrade the pump in preparation for other modifications, so if it goes away, then I'll know.
I have to agree that the Fuel pump upgrade is a good idea.. With the cooler weather, I found I was getting intermittant detonation with ONLY a turbo back exhaust and open air filter.. I was wracking my brain looking at things that could have been causing it and came to the conclusion (without adequate instrumenation its tough) that it was fuel cut or not enough fuel volume under certain circumstances. I will certainly attempt to upgrade the pump in preparation for other modifications, so if it goes away, then I'll know.
I would suggest you check the a/f ratio out with a wideband
Usually we don't see the need to upgrade the fuel pump till 290 - 310 whp - depending on the car
I would suggest that every one get the Walbro pump AND a in car fuel pressure gauge they are musts if you plan on doing mods
Oct 26, 2003, 08:20 AM
#34
Originally posted by zstryder
So will I need to actually readjust any of my boost/SAFCII settings after installing a fuel pump? Or is it a kind of install and forget sorta mod?
So will I need to actually readjust any of my boost/SAFCII settings after installing a fuel pump? Or is it a kind of install and forget sorta mod?
Oct 26, 2003, 10:43 AM
#36
Originally posted by Space Monkey
So the fuel filter accompanies the fuel pump? If that's the case might as well change the pump too. How often are you supposed to change out the fuel filter?
So the fuel filter accompanies the fuel pump? If that's the case might as well change the pump too. How often are you supposed to change out the fuel filter?
thinking??!!! Oh I know you need your fuel filter changed every 3K cha ching thats $300 please 
Oct 26, 2003, 11:25 AM
#37
I have never heard of a fuel filter needing to be replaced every 3k miles. More like 30k if even then. Maybe we should check the mantenaince schedule before posting numbers from our ***.
Oct 26, 2003, 11:40 AM
#38
Originally posted by sir lurks alot
I have never heard of a fuel filter needing to be replaced every 3k miles. More like 30k if even then. Maybe we should check the mantenaince schedule before posting numbers from our ***.
I have never heard of a fuel filter needing to be replaced every 3k miles. More like 30k if even then. Maybe we should check the mantenaince schedule before posting numbers from our ***.
Last edited by MP5; Oct 26, 2003 at 12:19 PM.
Oct 26, 2003, 11:45 AM
#39
When I was looking for the filter in the shop manual, I was also looking for the service interval. I couldn't find it for the fuel filter!
Normally something that large has a 60,000 mile life.
Normally something that large has a 60,000 mile life.
Originally posted by Space Monkey
So the fuel filter accompanies the fuel pump? If that's the case might as well change the pump too. How often are you supposed to change out the fuel filter?
So the fuel filter accompanies the fuel pump? If that's the case might as well change the pump too. How often are you supposed to change out the fuel filter?
Oct 26, 2003, 12:04 PM
#40
Originally posted by Space Monkey
So the fuel filter accompanies the fuel pump? If that's the case might as well change the pump too. How often are you supposed to change out the fuel filter?
So the fuel filter accompanies the fuel pump? If that's the case might as well change the pump too. How often are you supposed to change out the fuel filter?
's reason for this from 13B-2 is:"A fuel pump module, including fuel pump, fuel filter, reservoir cup and fuel level sensor (main), has been adopted to lighten weight and improve serviceability."
Oct 26, 2003, 12:07 PM
#41
Originally posted by Hammerli
The exploded view on page 13B-18 shows that the fuel filter is integral to the white plastic module housing, but you wouldn't need to buy the pump, level sensor, etc. Now I am sure it costs more than an inline, but probably not as bad as $300, since you don't have to get the whole module, just one component.
's reason for this from 13B-2 is:
"A fuel pump module, including fuel pump, fuel filter, reservoir cup and fuel level sensor (main), has been adopted to lighten weight and improve serviceability."
The exploded view on page 13B-18 shows that the fuel filter is integral to the white plastic module housing, but you wouldn't need to buy the pump, level sensor, etc. Now I am sure it costs more than an inline, but probably not as bad as $300, since you don't have to get the whole module, just one component.
's reason for this from 13B-2 is:"A fuel pump module, including fuel pump, fuel filter, reservoir cup and fuel level sensor (main), has been adopted to lighten weight and improve serviceability."
Oct 26, 2003, 01:38 PM
#42
Originally posted by MP5
Thats not going to be a fun experience for the checkbook and certainly something that cannot be done by the local Jiffy Lube Crew! What was thinking??!!! Oh I know you need your fuel filter changed every 3K cha ching thats $300 please
Thats not going to be a fun experience for the checkbook and certainly something that cannot be done by the local Jiffy Lube Crew! What was
thinking??!!! Oh I know you need your fuel filter changed every 3K cha ching thats $300 please
Oct 26, 2003, 01:56 PM
#43
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Originally posted by MP5
I buy everything except "serviceability" How could a fuel filter mounted on a strut tower not be the ultimate in "serviceability"??
I buy everything except "serviceability" How could a fuel filter mounted on a strut tower not be the ultimate in "serviceability"??
Oct 26, 2003, 02:09 PM
#44
Originally posted by MP5
I buy everything except "serviceability" How could a fuel filter mounted on a strut tower not be the ultimate in "serviceability"??
I buy everything except "serviceability" How could a fuel filter mounted on a strut tower not be the ultimate in "serviceability"??
Oct 27, 2003, 08:24 AM
#45
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BTW I don't know if there was possibly a particular problem with my fuel pump, but the new pump seemed to clear up intermitent knock at all RPM ranges. The most sensitive knock area seems to be between 5k to 6.5K. I never monitored my fuel pressure but the wide band A/F ratios remained very consistent so....
It will definiately make your car run richer in the higher RPM's so you will want to make adjustments to your fuel map after replacing the pump.
Either way, the fuel pump is a relatively cheap easy mod, well worth the added insurance IMO.
It will definiately make your car run richer in the higher RPM's so you will want to make adjustments to your fuel map after replacing the pump.
Either way, the fuel pump is a relatively cheap easy mod, well worth the added insurance IMO.