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kevin
Dodge Dakota
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7/21/2004
00:16:15
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 Subject: Fuel Pressure
IP: Logged
Message:
Reading the fuel pressure gauge when under full boost drops from static 48 to 42 and holds steady under full boost. I thought fuel pressure should raise under boost from a blower. But not sure about Dodge and their fuel pressure regulators etc....
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Heavy Hitter
Dodge Dakota
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7/23/2004
17:12:55
|  RE: Fuel Pressure
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Message:
The fuel pressure regulator on the Dakotas is on top of the tank with no maifold reference. If it's dropping that's because the fuel pump can't support the flow requied under boost. Not sure who's system you've got but they have to make up for extra fuel required some how. Either a booster fuel pump in-line or the Holley in tank fuel pump for boost applications. Beware the Holley pump is just that. You'll have to remove the tank top fuel regulator, make some sort of tank plug, install a return line and add an SFMU to the fuel rails. You're probably going way lean with the pressure dropping.
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kevin
Dodge Dakota
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7/24/2004
11:45:47
| RE: Fuel Pressure
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Message:
It is a vortech sq trim 7-8# boost. It has secondary injectors on the plenum right above the throttle body. The fuel pressure gauge sensor is coming off the end of this unit. The air/fuel ratio at full boost was really close to 12:1 on the dyno.
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Heavy Hitter
Dodge Dakota
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7/26/2004
12:59:41
| RE: Fuel Pressure
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Message:
Sounds like it's OK. Did it run the same fuel pressure on the dyno? If so, you're just exeeding the pumps capacity at 49.5 psi but that issue has been tuned out with the programming on the secondary injectors. If not it may be the filter in the tank, which is starting to get clogged, starving the pump a bit at WOT.
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kevin
Dodge Dakota
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7/27/2004
11:06:03
| RE: Fuel Pressure
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Message:
How many fuel filters are involved in the 01 R/T? I will change them all if it will help!
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Heavy Hitter
Dodge Dakota
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7/27/2004
13:23:20
| RE: Fuel Pressure
IP: Logged
Message:
Kevin, the filter is on the fuel pump in the tank. Sort of a pain to change if you don't need to. I bet it's a, dealer only, item $$$. Might be more cost effective to change the pump if you're going to drop the tank. I know the Holley replacement will put out more than enough volume for your application so you should never see a pressure decrease.
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another mark
Dodge Dakota
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7/27/2004
13:27:12
| RE: Fuel Pressure
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Message:
you can order the pump assembly through other businesses
besides the stealer, napa and partsamerica.com both have them
and for a hell of a lot cheaper
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kevin
Dodge Dakota
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7/28/2004
10:44:00
| RE: Fuel Pressure
IP: Logged
Message:
Do have part numbers or pump rating figures to go by?
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Heavy Hitter
Dodge Dakota
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7/28/2004
17:33:42
| RE: Fuel Pressure
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Message:
The Holley number is a 12-922. 255 LPH @ 80 psi. Here's the link to Holley => http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFP/InTank.html
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kevin
Dodge Dakota
JOIN HERE
7/28/2004
22:07:43
| RE: Fuel Pressure
IP: Logged
Message:
looks like they stop @ 99' mines an 01" any difference? I will call holey and ask if you do not know.
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Heavy Hitter
Dodge Dakota
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7/28/2004
23:57:23
| RE: Fuel Pressure
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Message:
Put one in my '00 Durango but couldn't use their new upper float housing. I think that's primarily due to the Durango having a low profile tank as opposed to the trucks. It was much taller and wouldn't fit in my tank. It just meant I couldn't cut the stock top housing off as instructed.
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