hi guys,
ok we are talking about a 1991 L98 vette here
last week i replaced my standard in tank fuel pump with a TRE performance with a hp 255 l/p/h fuel pump.

any way i removed the 10 amp fuse before i pulled out old the fuel pump and also replaced fuel filter.
now i dont have any fuel preasure reading on my guage with the aeromotive adjustable fuel regulator.

could this be that i put the new fuel filter around the wrong way may be ??

which way should the arrow on the filter being facing please ??

i belive that the fuel pump is priming on for the two seconds.
if some of the earls fittings are not quite tight can they then make them get a air leak may be ??

also while i was cranking the engine for short bursts, and i had the allen key t-handle stil attached to end pf aeromotive fuel reg to adjust preasure, i noticed while i was cranking it that the allen key t-handle was turning with the engine while cranking over,why is that ??

i noticed that there is a fuel trickle coming thru the main fuel line though,but no preasure.
also r.e the metal fuel lines pipe near the motor, is the main fuel line have the coil wire/spring wrapped around it does it please ??

may be i put the wrong fuel line on connected up to my new -6an s/s braid lines connect to my new 8 t/b intake possibly ??
how about the 20 amp fuse under the hood near the wiper motor ,may be that has blown ??

i cheched the 10 amp fuel pump fuse it is ok.
i belive also that i have the correct fuel lines connected to the fuel reg ok.
the left hand side drivers fuel rail is connected to the side of the fuel regulator, then the bottom of the regulator the hose connects back to the return line.
also on the new repacement fuel pump i had to cut old two wire standard plug and soldier up the new pump wires to the standrd pump wire,is soldiering them could make a less strength signal may be ??,

but the soldiering was done strong and well done though with shrink tape also fitted.
what else to check guys please ?
any ideas please
thanks alot
shae

 

c,mon guys,please help me out here, im pulling my hair out here whats left of it that is,lol !!!
cheers
shae

 

Can you hear the pump run? If you can hear it run and you're not getting any fuel you may have wired it backwards. I think I did that to my first one. If you reverse the wires on the plug it runs backwards and doesn't pump at all.

 

You say you're gettin' the initial prime when you turn the key on, but not thereafter, when the ECM gets a rpm signal, and re-activates the pump...



If there's a separate power feed for the secondary signal to (re-activate), this might then NOT be connected...

 

hi jleatherman and schrade,
thanks guys for your input r.e fuel preaure woes.
so yes guys, when i turn the key on i can hear the pump prime for two seconds or so.
i did for get to mention that i put an extra 20 litres of fuel in tank also.
if i did wire the fuel pump around the wrong way,would it of wrecked/ruined the fuel pump at all ?
i was getting a trickle of fuel coming thru though the main fuel line,but thats all.
is a 10 amp fuse for the fuel pump the rite size is it ?
also i think i will re check the new fuel filter to see if i put it with the flow facing the rite way towards the engine.
so i wil check the pump wiring again now and see if that is where i might of stuffed up .
but if any one has any further ideas,please let me know and i will keep you posted on whats going on.
cheers and thanks
shae

 

Haynes (Charmin, cause that's what it's good for) says check fuel pump wiring, but no pump wiring is in the diagrams.

What pressure do you get when it primes?

The article says the ig module in the distributor sends a signal to the ECM, for the pump to re-activate, after the engine starts.

You need the wiring diagram, to check the ig module output, then the output from the ECM to the fuel pump relay, then from the relay to the pump.

AND, as I said before, is the wiring circuit for the priming, and the circuit for re-activation, the same wiring, or are there two different wire circuits?

 

hi schrade,
thanks again for the reply back!

i dont get any preasure when the pump primes what so ever

you mentioned about the distributor,well i dont have my new msd billet small cap distributor yet as it is on its way over by air mail,may be the problew i have is for that reason,no distribtor/wiring hooked up yet ???

well i checked to make sure i had the new fuel filter with the arrow facing the front of the car,its fine.
also when i turn the ignition on for two seconds the main fuel line is pumping fuel out,

so it must be working ok i guess!!
but what i cant understand is why my fuel preasure guage is not showing any fuel preasure at all??

the guage is not that old and was working with the old tpi fuel rail shroder valve system!
but this new aeromotive adj fuel reg has the 1/8" port for the fuel preasure guage but it doesnt have a valve release though like the old shroder valve does.

is this may be why it is not showing fuel preasure ??

i cant work out why the fuel preasure guage isnt working ??
any ideas guys
thanks
shae

 

Then the guage must be faulty. The article says the fuel pump primes the rail, til pressure is up (43psi, according to the article), then the pump shuts off, till the motor fires, and the ig module in the distributor tells the ECM to re-activate the pump.

Can't be. The pump primes first, regardless of ig module signal output.

But with no pressure showin' on the guage???


don't know the answer to that Q.

 

hi again schrade
i cant understand why the guage isnt working any more,its not that old and it was working on the old tpi set up.
may be some thing to do with the new aeromotive adj fuel regualtor?
i dont know!!
i wish some of these other known helpful locals here on this site would chip in and have a say,but so far no luck!!!
may be i should change user names,may be i will get more replys,lol
so basically the fuel pump seems to be working,pumping fuel but no preasure at all showing on the guage.
im not sure what to check or do now ???
thanks for your help.
cheers
shae

 

can anyone else please help and advise me on this problem i have ??
thanks
shae

 

Try putting the old FPR in and attach the gauge and see what you get.

 

hi there quiktrp94,
thanks for your reply.
i cant use the old fpr on my set up.
i am using a stand alone adj fuel preasure regulator as i am not running a normal tpi intake or plenum style set up.
im running a 8 t/b intake.
thanks
shae

 

Yes, a 10 amp fuse is correct for the fuel pump. Remove the gas lid and rubber boot. Take the top hose going to the right, loose. Hold something under it to catch fuel. Have someone turn the key "on" while your at the tank. Fuel should come out of the metal line with pressure for 2 seconds. If it does, you may have a kink in the fuel feed line somewhere or backwards fuel filter. You can also take the fuel filter off and do the same procedure. Just know the precautions of dealing with raw fuel.

If no fuel comes out, you will need to pull the fuel pump and check the wiring.

 

hi rrt vette,
thanks for the reply.
i definately have fuel coming out of main fuel line supply at either end for two seconds or so,so i dont think the new fuel pump is the problem!
but i just cant understand why my new aeromtove ajustable fuel regulator /screw in guage wont show any preasure at all?
this regulator doesnt have a shroder valve though like the old tpi fuel rail/reg had though,is that the problem may be?
also the i doubled checked the new fule filter is on the rite way/direction, it is also fine as well.
im stumped on whats going on ?
cheers
shae

 

Check and make sure the fitting on the car and the fuel pressure gauge has the little valve inside. I purchased a fuel pressure gauge that did not have a valve in it and came with a tool to remove the schrader valve.

 

hi rrt vette,
thanks for still persisting with my little problem i have!
it may now of occured that fitted the wrong fuel lines on the stand alone aeromotive fuel regulator around the wrong way possibley which i will try and see.
r.e the guage,there doesnt appear that it has a little valve inside at all.
thanks
shae

 

What we know so far

• There is fuel in the tank
• Power to pump
• Filter mounted with arrow in direction of engine
• Pump moves fuel in direction of engine

Which Aeromotive fuel pressure regulator do you have?

Generally, their A1000 Injected By-Pass series have the inlet/outlet
ports on the side and from the instructions, it does not seem to matter
which side is inlet/outlet. The by-pass return port is on the bottom.

Here is an image of a A1000 #13101 (30-70 psi, -10AN/-10AN/-06AN)

Compliments: Summit


There is a hose nipple fitting mounted in the cylindrical regulator
section. This is a vent line and can be hooked to a filter for
atmospheric operation (or to the manifold for boosted operation
IIRC.)

There is also a 1/8" pipe plug in the rectangular body section.
This is the pressure sensor port.

Is there any chance that your pressure gauge has been installed
into the regulator vent port?

As for a Schrader Valve to relieve pressure or attach a temporary
fuel pressure gauge, this is a provision that usually occurs in the
fuel rail plumbing, not at a stand-alone FPR.

Aftermarket manifolds & rails may or may not include a fitting with a
Schrader Valve to be mounted at one end of one of the rails. It may
not be very clear, but this Holley Universal kit (#9900-172) shows a
Schrader Valve (with a black cap) on the right side of the lower rail.
The valve mounts into one of the 90º fittings.

Compliments: Summit


Yet some other Holley kits include neither the SV nor a 90º fitting that
has the port for the SV.

What size fittings are used on your fuel rails? Perhaps Aeromotive, Earls
Aeroquip, Russell, Holley or someone else has fittings that you can use
to add a Schrader Valve to your system.

.

 

Some possible solutions for adding a Schrader Valve. Realizing that
you are beyond the back of beyond as regards delivery and returns
for parts sold in North America, be sure to do your own research to
select the most suitable part(s).

Russell offerings

One of these might work with the existing fittings for the hose at the
back of the fuel rail.

670340: -06 AN male to -06 AN female w/ 1/8" NPT female
670350: -08 AN male to -08 AN female w/ 1/8" NPT female
670360: -10 AN male to -10 AN female w/ 1/8" NPT female


Aeroquip offerings

Either of these next two styles might be used either in the cross-over
hose that joins the fuel rails at the rear of the intake.

FBM2183: -06 AN male to -06 AN male w/ 1/8" NPT female
FBM2184: -08 AN male to -08 AN male w/ 1/8" NPT female


FBM2272: -06 AN male to -06 AN male w/ 1/8" NPT female
FBM2273: -08 AN male to -08 AN male w/ 1/8" NPT female
FBM2274: -10 AN male to -10 AN male w/ 1/8" NPT female


For someone with a regulator that has NPT female ports, these
might be installed in the NPT outlet of the regulator.

FBM2277: -06 AN male to 3/8" NPT male w/ 1/8" NPT female
FBM2279: -08 AN male to 3/8" NPT male w/ 1/8" NPT female


I don't see Aeromotive gauge adapter fittings, but this does not mean
they are not available.

As for Schrader Valves - look for ones with a Viton seal, these are
intended for fuel use. There are valves with neoprene seals that are
sold for A/C use. Valves sold for tire use have seals made from Nitrile.
Viton is the material that is compatible for fuel use, the others will
degrade with exposure to fuel. Different additives will affect neoprene
and nitrile in different ways and at different rates. While some here use
non-Viton, it is not recommended.

Where to get a Schrader with Viton? I don't know a source for the
valve alone at the moment. In a pinch, I would buy a Holley 9900-163
which is a 90º fitting with a Schrader valve (1/8" NPT) like shown
above. I'd put the fitting on the shelf, install the valve and move on.

Maybe someone with a better Schrader solution will post.

.

 

hi slalom4me,
wow,cool man ,thanks your help and great write ups
i appreciate the help mate!
ok, the areomotive fuel reg i have is #13105 model.
the fuel size fittings i am using are -6an size.
i fitted the fuel preasure guage on the reg in the only small 1/8" port there is on the regulator.
what if i was too drill and tap the old tpi shroder valve into my news style 8 t/b intake fuel rail might work ??
so what i have done is fit the main fuel supply to the side port, then return fuel line to the bottom port, then i have my vaccum hose from manifold to the nipple port as like in the picture on the cylindrical section.
so do you reackon that i shouldnt be running my preasure guage of the regualtor itself then ?,better too run it off the fuel rail then??
will the guage work ok if i fit the guage on rail before the regulator?
also with shroder valve fitting,how does the valve open when the guage is screwed on ?
lastly now that you have seen the pictures of the intake and fuel rails on the other thread msd small cap distributor,where would be the best place to fit the standard tpi fuel rail shroder valve on my rails do you reackon please ?
any way thanks so kindly for your help and advice mate!
cheers
shae

 

Maybe it's to early in the morning for me, but first off, you stated the allen key T handle was turning while cranking the engine over? that doesn't sound right to me....I'd tighten that puppy down some.
Second, I'd try using one of the fittings Slalom4me showed or any fitting (temporarily) that would allow me to connect to the fuel line and the rail while allowing me to connect a fuel pressure guage to it, whether your injectors are batch fired or sequential doesn't matter, their not going to fire without a signal from the distributor so you should be able to get a fuel pressure reading. If I'm wrong...someone please correct me?