Hey everybody,

I decided to install a factory mechanical fuel pump and eccentric in my carbed dakota. When i bought the truck, the owner had a carter pump on the rail...i could only drive it for about 20 30 mins before it would start to fluid out from the carb! The truck is a 90 dakota sport with an 87 engine. Turns out he also had power coming from the in tank pump also. To much pressure lead to flooding! So I got my mechanic to install the mech pump, disconnect the power from the in-tank pump. The truck started up great after the install....but in lest than 5 mins the carb just starting flooding again! Why would this happen quicker than the on rail pump I thought? So before I blame it on needing a new or rebuilt carb (holley 4bbl 390cfm list# 8007) I figure i could install a holley adjustable fuel pressure regulator. seen one on the holley page (part number #12-803bp 4.5-9 psi). Not really sure which one i need to be honest with you! would love some guidance!

tks

 

I would say the Carb need adjusting. Maybe not a full rebuild but just an adjustment. Some rebuild kits are cheep. Also get a fuel pressure gauge and find out exactly what your pressure is.

By putting a regulator on it is just a band-aid on it. Fix it right the first time. Also the web site has installation instructions. http://www.holley.com/12-803BP.asp

 

The fuel pressure from the 90 is for tbi, not carb application, so you need to reduce the pressure to the carb with a regulator (whatever the carb manufacturer recommends. I am using a one in, two out for the return line to the tank. If your flow is too high, you will flood the carb. Since you are running a mechanical pump, the output is dictated by the design/ flow rating. I think you are flooding from the float adjustment. Not sure if you have windows or not, but the carburetor is the item to look at. Put a gauge between the pump and the carb, to see where you are at. I think they are about $10-$25.

 

Wow....thanks for all the responses!! Sorry it took so long to get back! Working out of town and no access to a pc. I ended up rebuilding the carb, sold it, and bought a brand new one!! I also purchased a deadhead style adjustable fuel pressure regulator! Should be able to install it this weekend....just a little confused on how to hook it up....I understand how it works (there are two outs on each end, then in on the bottom). In from fuel pump on the bottom, out to carb on right side (out), then plug the left end with "dumbie" fitting. But a friend told me to check and see if i have a return line back to the tank....if so then i don't plug the left end "out". Confused about that....not really sure how to check if i have a return back to tank??

 

You don't necessarily need a return, you could put a tee before the regulator then plumb a line from the 2nd out back to the tee.

 

Awesome!! Thanks very much for all the responses!! Hopefully the weather here in calgary warms up a little so i can go work on it!

 

hey peeps i posted a few pics online....maybe someone could guide me in the right direction in regards to what my mechanic hooked up & how I hook up my adjustable fuel pressure reg! (deadhead style) not a bypass reg. looks like he is using the return line now (was capped off before)

tks again!

 

webpage address...opps!

http://www.picturetrail.com/chrisblaze

 

Looking at your pics leaves me to think you do not have a fuel pressure gauge. Which is neccessary to properly dial your pressure. I am not a fan of "dead heading", but it is what you have so I hope it works for you. Without knowing where you are, it is difficult to determine where you need to go. so:

A: Install a fuel pressure gauge.

B: Adjust float setting.

C: Determine carb flooding potential.

D: Admire your resolve.

Hope that helps.