Hello, well this morning when I got off work I went to start my 93. It just cranked and didnt start until I held the pedal to the floor. One of the things I loved about this truck was it just popped right off when you just turn the key. I had the throttle brackets off but I was sure I put them back right and have started the truck about 25 times after that with no problems. (so I dont think its throttle indexing problem) Could this be a sign of the lift pump going? Have any of you had this problem before something went? I really dont understand the injection pump so can someone please tell me what holding it to the floor did to make it start? (does it work like a carb?) Thanks

 

Due you have to start it up every time like that(foot to the floor)or just after it set over night. Lift pump is a good idea but haven't had to dill with that one.......Yet to now. Is there any fuel leaks any wares. might be time for the clear plastic hose trick to see if your sucking air some whares between the fuel tank and the lift pump!

So how's the top end running sence you got the pin free!!!!

 

Good morning flashgordon, no it usually starts without even touching the pedal, just tap the ignition switch. Thats why this bothers me so much. I dont see any fuel leaks at all. I am going to let the truck set for a couple hours and go see how it starts this time.
I havent towed with the truck since the fuel pin was fixed but it sure feels better without a load. I really want to get to that full fuel screw so I can get some smoke out of this thing The schedule for racing doesnt look good for the next month so it might be awhile before I tow again, but I'll be sure to post after towing with it.

 

Cool keep us posted.

a nether thing that you can try, if it don't start after setting, and air is suspected if putting are in the filler neck and see if fuel leaks out!! be carfull thow just a fue pound of pressure,you dont want to spit the tank!

 

ok, this is the problem. The truck use to pop right off without even touching the throttle. Well after sitting for 24 hours yesterday I tried to start it by just cranking it. It would just crank and didnt start. I held the pedal to the floor and it fired up, (with a big cloud of white/gray smoke) idled great and ran great. So I get home and let it set for 3 hours. When I went back out to fire it up it popped off with just cranking but it idled rough for about 5 seconds (kind of like a flooded carb) then smoothed out and ran great. Anyone have a clue as to what might be going on. I tried to do some searches and was just curious if this could be the fuel shut down switch going out? It shuts down fine so far so I dont know what to think. Is there anyway to test the shutdown switch? Thanks

 

i don't thing that it has to do with the shutdown sw cause it has to do with time.

My guess is still, air in the fuel........time to get some clear line and watch for air buubbles in the fuel. You can leave this line on for week if you want, never had a probem with it.

If it is a leak in the sucksion line it might be faster (if you have conpresser availble) to just pressure the tank and if fuel falls to the ground then the problem is found!!!!!

Could also be a leaky inj...... but air leaks should be ruled out first.

 

Where do you put the clear line? (best place to plumb it) What type and what size are the factory fuel lines? Forgive the newbie ? but the way things are going I may be advertising in the classifieds soon. Thanks

 

You're drawing air from somewhere. You're gonna have to visually inspect every inch of the fuel supply line to find the leak. The second time mine started leaking, it was the steel sections right after the sending unit on the tank...the lines take a couple hard twists in that area and they were rusted and weeping fuel...not enough to drip, just enough to draw fuel out of the pump and wet the inside of the frame rail...there's enough salt and mud on the frame rail to absorb about 100 gallons of diesel, so it was probably leaking for a long time, but I didn't notice till it got bad enough to bleed the injection pump.

 

Put the clear line right between the lift pump and the factory fuel line.

I am 100% certain you are sucking air. Do like flashgordon said and blow some air at low pressure (use a shop rag and a blowgun in the filler neck), then crawl under and do what Greg said. You'll find the leak.

 

Wannadiesel, I was doing some more searching and came across a similar problem as mine and it turned out to be a return check valve in the lift pump. Could this be the problem? It still has the factory lift pump. I will check the lines real good when I get back home (a couple weeks) but I did a real quick look and didnt see any fuel leaking or wet spots Thanks for the help AGAIN

 

Yes, a lift pump can cause that too. The '92's and '93's don't have much trouble with the lines because they are mostly plastic, but that section right up on top of the tank has some metal.

 

Thanks, I guess I will run down to napa and get a lift pump and start with that. Then if that doesnt do the trick I'll have to check the lines better. Thanks for the help. Later

 

Hello, does anyone happen to have pics with a clear tube plumbed in to check for leaks? Thanks

 

you need a clear line between the pump suction line and the pump..........just went out and looked at mine and if yoiu remove the rubber line were it ataches or is between the frame and the pump and put the clear line there it will tell you if you'v got air in the line! you should be able to to get it at any part store, hardware store or even a motersycle and snowmobile shop!!!!

 

Just a little more info......the fuel line is 5/16 so any clear hose, with 5/16 "in side diameter", will work fine!!

get six or seven feet of the hose if it's cheep enuff....i now vinyl is. then you can put it thru the rear of the hood and thru the wiper arm and back to the pump!!!!!

then you can just set there and watch for bubbles in the compfert of you seat,ac and stereo.

Then if you deside to take it for a drive you just slide it off the wiper and lay it on or around the master sylnder and your set.

Make shore that you have pumped the lever long enuff so that the clear tube is full,and the hose clamps are tight, before trying to start it, though!


? i now that your out of town, but or you with, or with out your truck?